Malicious PDF — malware analysis report

Static analysis result for SHA-256 490c58988d47da83…

MALICIOUS

PDF

39.9 KB Created: 2020-08-09 19:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c0c8bb941f58740b436c2296288b7d02 SHA-1: 1dcec42c327d5c56f8a0e9f7fecd1674c643af53 SHA-256: 490c58988d47da83baa4dc0d01ecdd3aec0b6d83e26d0e1bc7cb4356a75912e5
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with the primary link leading to a known malicious redirector. The document body, though heavily obfuscated, contains text fragments and URLs that suggest a lure related to 'cell biology journal articles'. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be tricking the user into clicking a link that leads to malicious infrastructure.

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.com/pify?keyword=cell+biology+journal+articles+pdf In PDF document text
    • http://files.mallimopianostudio.com/uploads/1/3/1/4/131408572/tokijinowazu.pdfIn PDF document text
    • http://files.pholanasianbistro.com/uploads/1/3/2/6/132682684/2351157.pdfIn PDF document text
    • http://detomexa.frigatebirdfishing.com/uploads/1/3/1/6/131606349/5093209.pdfIn PDF document text
    • http://mebakin.vanengelsdorpbeelab.com/uploads/1/3/2/6/132682090/5b041bdb45.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/1/0431/7783/6703/files/73277356076.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6756/2391/files/lewavezimefipatedu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0181/3915/files/sufiwegulexogub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/40710431877.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/6740/4451/files/tinuwijepujamosivibizetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0508/3811/files/15604352736.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5359/4277/files/nirofizuduji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2693/1099/files/automann_catalog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59044096386.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8524/2269/files/25570893955.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0409/9735/files/jidizulelusidik.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 2

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_off00005e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E89 5544 bytes
SHA-256: 78ca28b0d8469586184fcd09f9caba476a75b2e3983a255cfdeefddae97e4097
font_01_sfnt_off00007176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7176 9784 bytes
SHA-256: 4ceb71aeb9cb88bda8a9c964e32fad4c8c41a994ea519317887e0bb59aab6edc

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