Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcae8e183d535a6a…

MALICIOUS

PDF

47.7 KB Created: 2020-07-31 07:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 31a23e063a3269874f1e520d5981cb8d SHA-1: c2af40265021d929ac21d6c3bf215f61784d9eb6 SHA-256: dcae8e183d535a6a64d5a3272fa4d35bb2a781194e3e355204d3361f2212558c
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is the primary attack vector. The document body, though heavily obfuscated, appears to be a lure related to 'Angularjs interview questions'. The presence of numerous external PDF links, many hosted on cdn.shopify.com, suggests a link farm designed to improve SEO for malicious content. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=angularjs+interview+questions+and+answers+for+freshers+pdf In PDF document text
    • http://files.trueyouarttherapy.com/uploads/1/3/1/4/131437283/3cd631.pdfIn PDF document text
    • http://files.quasilocum.com/uploads/1/3/1/3/131380733/dazepip-tefifipipewesex.pdfIn PDF document text
    • http://files.roadrangersbassclub.com/uploads/1/3/0/7/130775850/9594318.pdfIn PDF document text
    • http://files.evanmueller.net/uploads/1/3/0/7/130776519/7640331.pdfIn PDF document text
    • http://files.jocelynpearsoncoaching.com/uploads/1/3/0/7/130739401/fetijag_feboxe_fezufod.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/1/0428/9835/8432/files/zugazad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22893269325.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2133/5702/files/wurimutatop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6802/3194/files/66862790881.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58143530911.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3971/1644/files/mozova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0641/9367/files/75532845516.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9671/7992/files/21529066710.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/74892584582.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6234/5384/files/96679113135.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6992/3740/files/xarew.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_off0000791a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x791A 5528 bytes
SHA-256: fe6fec404a0322b2da66c947c39e3ed367dd6a4e553369128b9070f34e87d653
font_01_sfnt_off00008bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF1 11036 bytes
SHA-256: 3337746594fedea02c34ebde696d00565c8933639b975c2e789b3a9880e2aba7

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