Malicious PDF — malware analysis report

Static analysis result for SHA-256 157a3d85cbe0d7e1…

MALICIOUS

PDF

35.5 KB Created: 2020-08-26 07:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e300954ce0f79ed7550043eeadfac220 SHA-1: bb5858ea9de246252f701bec9a7a3ff4f73de0e3 SHA-256: 157a3d85cbe0d7e173f6b6372dc7079029b336e72948b3eec0c2a8bcd9a55837
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body and heuristics suggest a lure for free downloads, leading to a phishing or malware distribution site. The ML classifier strongly supports the malicious nature of this PDF.

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=complex+analysis+zill+3rd+edition In PDF document text
    • http://kanofuf.uniontownartclub.org/uploads/1/3/0/7/130739974/c38b0dcec15636.pdfIn PDF document text
    • http://files.omraneguedhami.com/uploads/1/3/1/4/131453256/ef738c.pdfIn PDF document text
    • http://jitaju.lottiecreates.co.uk/uploads/1/3/0/7/130738970/xilirin.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/1/0447/9575/6693/files/secrets_of_the_psalms.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34007074416.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1536/2984/files/true_magazines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/remorinafarefepezud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9065/6936/files/vopidovefir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1868/1496/files/brain_teasers_quiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5632/3995/files/luvepuwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/6234/0258/files/alfabeto_en_ingles_y_espaol.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_off00004c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C71 5396 bytes
SHA-256: c1fb5354c886d526d09782735e9c8b4639955809517b49cbcaf0629093b95fd2
font_01_sfnt_off00005eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBA 10384 bytes
SHA-256: 901641939f6d06fe36f305db54d1675c069d31777ddeca6d65bce792347a26cd

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