Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73024fdd5ac2244…

MALICIOUS

PDF

42.6 KB Created: 2020-08-23 09:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 447484ced2099bef6b54e9641dca8e62 SHA-1: a48124e03acf1e053c0e4700d59efae5cb9e4ba2 SHA-256: f73024fdd5ac22447cc1936d2204178802baf113e3d9b65188339d99cf942d33
194 Risk Score

Malware Insights

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

The PDF contains a link farm, with multiple embedded URLs pointing to external PDF files. One of these URLs, https://ttraff.ru/pify?keyword=chess+pieces+moves+cheat+sheet, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a lure to a malicious site under the guise of providing useful information.

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=chess+pieces+moves+cheat+sheet In PDF document text
    • http://kunuruku.breedengallery.com/uploads/1/3/2/7/132740829/7213947.pdfIn PDF document text
    • http://sijotexun.graceforthebroken.org/uploads/1/3/2/6/132695780/vexemawepogu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/1295/9905/files/organelos_de_la_celula_animal_y_sus_funciones.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8339/7275/files/74944199707.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7609/1046/files/auditory_discrimination_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0954/8188/files/free_ebook_reader_for_windows_7.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1064/6435/files/77732408033.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7453/3014/files/lelozozejetujotajip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5804/4823/files/topik_intermediate_vocabulary_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/sogivojutexevixekonir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/bramman_tamil_audio_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4550/9537/files/tinutuvozelezasejesitoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9525/2374/files/zabebotoganevozarexobop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7214/4038/files/sanatuzelasekonupikujuj.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6870 5012 bytes
SHA-256: 1f0cdb360d08c82d453a4fca028cc262d80b974b60506422dd1c8f7e8f0b3f4c
font_01_sfnt_off00007962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7962 10600 bytes
SHA-256: 63902d851e9c50791d926bb109208db5ea46af98696e2b637bbe809c4d45711b

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