Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1dc2d75b3cade88…

MALICIOUS

PDF

67.0 KB Created: 2020-08-13 21:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 71fd2fb14066fb106daa091b3f9075ea SHA-1: 20fcd5f77de725cbaad41a2e5ab8c00879164951 SHA-256: a1dc2d75b3cade882274a3933136bad08438471fa32a5fe82fb16e5a4ac4ce0e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, pointing to a URL that appears to be a lure for a modded APK. The document body also contains this URL and references to 'Valkyrie crusade 6.1.0 mod apk'. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The primary malicious URL is the redirector, which likely leads to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=valkyrie+crusade+6.+1.+0+mod+apk In PDF document text
    • http://files.1169certified.com/uploads/1/3/0/8/130813887/mepezamazoda.pdfIn PDF document text
    • http://files.thecheesecakebee.com/uploads/1/3/2/6/132681316/d265668104.pdfIn PDF document text
    • http://files.i40challenge.com/uploads/1/3/0/9/130969470/wopelemawaxe-jajozexem-salipeguta.pdfIn PDF document text
    • http://files.quadcityarts.org/uploads/1/3/0/7/130740221/fdbe5e801f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/visodatog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0369/9615/files/avant_propos_rapport_de_stage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5269/3669/files/bukojusof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5535/7852/files/rofivokexefumuxozisebep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5479/1832/files/mixug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/96625762394.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2892/3046/files/xikate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/jirofijite.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2758/6457/files/fupaku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0391/7974/files/travel_agent_job_description.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5369/5647/files/46887393517.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1424/9886/files/zokagige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4788/4702/files/are_you_smarter_than_a_5th_grader_quiz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBD 6672 bytes
SHA-256: 4bf80d4d82d8d17d4f271516afb9698f52afb942349c872042733a826fdb4c63
font_01_sfnt_off00009284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9284 5732 bytes
SHA-256: e1c63514a84210db324df9ff2eebe5d289a2c474e5d94e1f0838f22c15b80776
font_02_sfnt_off0000a5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5F4 6148 bytes
SHA-256: 488ffee5e9c33bcc1f3f00aec749f35977d0cdd209ffadaee35194d66ecc177d
font_03_sfnt_off0000b5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D4 15332 bytes
SHA-256: b8340a690da1633d9296e7746c53e75587321b00646667cf5145bcc7c55909c2
font_04_sfnt_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 16388 bytes
SHA-256: f22c3c415f763daa720385eeadc5e6b7f3a2e80f9eba5500c6dd36063ccab0ed

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