Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c2ac2a1767446f…

MALICIOUS

PDF

37.7 KB Created: 2020-07-28 22:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 386cd1127a0ee758fc2c5792c731faba SHA-1: 6c340efbe20db2283077063ef42ae7dfb11c8ff7 SHA-256: d9c2ac2a1767446f78122f170a767fd1b8cb3e487088d830d92a675518e32d57
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple heuristics indicating malicious intent, including links to a known malicious redirector and a link farm. The document body, though heavily obfuscated, suggests a lure related to 'audio tactics'. The primary IOC is the redirector URL, which is likely used to funnel victims to a malicious site or download further payloads. The ML classifier strongly supports the malicious verdict.

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=expanding+tactics+for+listening+audio In PDF document text
    • http://files.sboaschoolmdu.org/uploads/1/3/1/6/131606502/foxotakipib.pdfIn PDF document text
    • http://files.hillcountrywoodshop.com/uploads/1/3/0/7/130740196/93641.pdfIn PDF document text
    • http://files.alisondowell.com.au/uploads/1/3/1/4/131454352/2436010.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/1/0435/6187/7665/files/94309203686.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/49295448698.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3739/9957/files/zafilupa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7654/0834/files/38995882923.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2299/1007/files/29969906266.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/38607909060.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36281161478.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2255/7095/files/tizipalamasapab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/26268714285.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/895492321.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/7574711824.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/55080210499.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_off00005579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5579 5228 bytes
SHA-256: dbc85fe7d2f0c5d74cc7921f29cc64dbb2e511620c2cb8c1b8c381b255942025
font_01_sfnt_off00006753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6753 10124 bytes
SHA-256: b3ff27a3b6ba91c9c21e70651415f1513cc315cacf22590245ba41d26d185a56

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