Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a1c8118716986f…

MALICIOUS

PDF

46.1 KB Created: 2020-08-05 10:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6444082d489efe10bb169f8e92bc1a2 SHA-1: 2c793bb64c3e70418c98bbb670b7c904738fe6d8 SHA-256: 85a1c8118716986f871a4e44040ac97bf6bb8f7ca4c1e51ed70e5c1bfbbcc9cc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=pdf+to+word+converter+offline+free+download+filehippo`. This indicates the document is designed to trick users into clicking malicious links, likely leading to further malware or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=pdf+to+word+converter+offline+free+download+filehippo
    • http://files.dreamseedfarms.com/uploads/1/3/0/8/130873822/6421847.pdf
    • http://files.compelation.co.uk/uploads/1/3/0/7/130776821/fisexapoduvos.pdf
    • http://mipunifa.kirchner-architects.com/uploads/1/3/0/8/130814238/2391901.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/muwusiwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8790/4422/files/kujeb.pdf
    • https://cdn.shopify.com/s/files/1/0438/2529/9606/files/5486749350.pdf
    • https://cdn.shopify.com/s/files/1/0429/7729/6543/files/30796611073.pdf
    • https://cdn.shopify.com/s/files/1/0433/3420/5590/files/lawodenejobipabe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5564/4823/files/xabalamupowiwikifitol.pdf
    • https://cdn.shopify.com/s/files/1/0431/3523/8301/files/kiwawixojikopizarejazixi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/rezagaxunizifil.pdf
    • https://cdn.shopify.com/s/files/1/0431/2799/6565/files/katurusolutusifebipabora.pdf
    • https://cdn.shopify.com/s/files/1/0430/0115/1651/files/75540824132.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8135/files/old_forge_trail_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/zatez.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/tidowezunitafafefozexeri.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000758d.bin
0b21880f09fac21af8040ffe271c59d9626cb2cf3f8609f380a87ec036781e44
pdf-font-stream PDF embedded font (sfnt) at offset 0x758D 5220 bytes
font_01_sfnt_off00008762.bin
37cfe0303d5a540f5a5b9c272069980360256652891483e212986aaef84b6699
pdf-font-stream PDF embedded font (sfnt) at offset 0x8762 10372 bytes