Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c98f07e754814c8…

MALICIOUS

PDF

49.8 KB Created: 2020-09-30 10:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 1c72c81aa499ef092334664fa1c0a12d SHA-1: a38d77fbcbcb834ec9ff55be520dd201c94c0c53 SHA-256: 8c98f07e754814c8557fd97b63070bdc6791b7bfb6d952c6b4a78d0dfc65cca7
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=the+hindu+newspaper+word+meaning+in+hindi+pdf+download In PDF document text
    • http://files.blossomholistichealth.com/uploads/1/3/1/4/131406841/701751.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3466/4347/files/zufitejajetara.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6737/5770/files/dumivutuwaso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3486/9909/files/dolizifubokav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/2398/5828/files/augusto_cury_vendedor_de_sonhos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/incident_reporting_policy_healthcare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/winegard_carryout_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/4354/5237/files/formation_of_bilirubinate_gallstones.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8046/6080/files/transformers_bot_bots_tfwiki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1541/3661/files/20220283167.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9503/8877/files/53977807727.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1539/7788/files/14412775531.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4342/2359/files/91547537387.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8792/9245/files/big_bang_theory_theme_song_free.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 1

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6830 5496 bytes
SHA-256: 5efc4075d3f87e6e1cca72b85938936e2a2cfa87533a902830acaff8ff878351
font_01_sfnt_off00007ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC7 10152 bytes
SHA-256: 796ee8d691fa23ecd2a560ccf22a110f0fe290bbbeaf17ee358d6e3fc79cc864
font_02_sfnt_off00009d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D9D 8488 bytes
SHA-256: 2194d1dec5273c17b0e2f87dc353f66e78f12d8d88a2c03590916aed7e408d81

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