Malicious PDF — malware analysis report

Static analysis result for SHA-256 156896529e969706…

MALICIOUS

PDF

60.8 KB Created: 2020-07-30 15:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: eda7c63ed10a6b56fbe5b4be1a2ac516 SHA-1: 9cfa76ea278f5f889a1861a1c3ed51754c4b9e76 SHA-256: 156896529e9697064a58a07cd7c26b19f8db64cf64f39b43ef05fa4416c79c54
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links designed to create a link farm, with a primary redirector pointing to malicious infrastructure. The heuristic firings indicate the PDF is a malicious redirector and part of an SEO link farm, likely a phishing lure for free downloads. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=robert+sapolsky+behave+pdf In PDF document text
    • http://files.rightagri.com/uploads/1/3/1/1/131164009/9657356.pdfIn PDF document text
    • http://files.fbccrescentcity.org/uploads/1/3/0/7/130775603/2bb3ba.pdfIn PDF document text
    • http://files.siouxcenterwaa.org/uploads/1/3/2/3/132303219/patedupepobi_livagenixu_nudosiwatu.pdfIn PDF document text
    • http://files.dnewzdesign.com/uploads/1/3/0/7/130739835/4630712.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/1/0432/9350/7737/files/remulabefinetagikuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0762/2824/files/21842752781.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3722/1276/files/suposogom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/31907940146.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0304/4263/files/boxodoguten.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1503/5288/files/nawisiselarewi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/gogigedoji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/raneruxerexelazosona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/61510775486.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/72076265921.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/fipob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/noguguxevutetufetigetu.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_off0000b0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FA 5136 bytes
SHA-256: 178dab74fe90fdcbe92b80f807218fc57d22ea787b674643d2e0e0f9ea6e598b
font_01_sfnt_off0000c28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28D 10316 bytes
SHA-256: 5f8944c157d068152acbcb872773cac3a07d30dc201fcd720e1f035b510d6aca

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