Malicious PDF — malware analysis report

Static analysis result for SHA-256 151efff7529a76fc…

MALICIOUS

PDF

37.9 KB Created: 2020-07-30 14:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bc24f9d3cf03c7afef3270d74842bdd SHA-1: f8a41a9e5158325543529e0308d76ed3613f2f1f SHA-256: 151efff7529a76fc0837c3fac10406d46f00f4f0cdacc803bd85090144a2c79d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests an attempt to drive traffic to potentially harmful sites. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

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=english+vocabulary+in+use+mccarthy+pdf
    • http://files.alivesoap.com/uploads/1/3/1/8/131871701/0583a.pdf
    • http://files.danagbeje.com/uploads/1/3/2/8/132814096/libiriner-sogeferejimatas-pelafufonaju-majow.pdf
    • http://files.allergysafekids.org/uploads/1/3/2/6/132680874/tiburuj.pdf
    • http://files.gen12church.com/uploads/1/3/1/3/131379231/4507473.pdf
    • http://files.supercontinent-bp.com/uploads/1/3/1/0/131070011/wokadok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2016/3999/files/biginuzatufo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/49881909569.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6083/files/gosidazapowekiwatid.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/2007573522.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1110/files/biditawofijud.pdf
    • https://cdn.shopify.com/s/files/1/0437/7739/2794/files/76979174986.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/nawewolojexu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/fisoperowuvolejovodoliji.pdf
    • https://cdn.shopify.com/s/files/1/0438/8962/3208/files/13988834862.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/rizupaxodelazosogamu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/buxaterovamo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71860998709.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005601.bin
a54d780c0719c9c930cef7d95269b78ed6796c942e8ba5cd289db2d44df254ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5601 5708 bytes
font_01_sfnt_off0000693d.bin
b57ad284be3484d5d2ec136b079960f55f3b04eb7c1b090e1e112aaaec47434c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x693D 9168 bytes

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