Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88f17700dd4c59a…

MALICIOUS

PDF

39.8 KB Created: 2020-08-21 04:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16f335b678b06255c3c88d3e80dc7654 SHA-1: ca0472622e9b59c17664eb98cac362de560fc45f SHA-256: e88f17700dd4c59a0aa07b08ed84f547ac3b11e652e871c145d54b8899384fd8
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as free sheet music. This indicates a social engineering lure to direct users to potentially harmful content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the presence of numerous embedded URLs, including the malicious redirector, is sufficient evidence for this assessment.

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=primavera+ludovico+einaudi+sheet+music+free
    • http://boxazu.moranenterprises.com/uploads/1/3/0/8/130873995/nafarenedavas.pdf
    • http://files.lizguilmet.com/uploads/1/3/2/6/132682607/4d3c31ad86a0bb.pdf
    • http://files.avianexotichospital.com/uploads/1/3/1/3/131379382/murutaduveb_nebininop_limaga.pdf
    • http://files.achinabuffet.com/uploads/1/3/2/3/132303009/4667293.pdf
    • http://files.gertybrown.co.nz/uploads/1/3/1/8/131856146/69f4b.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/84654771719.pdf
    • https://cdn.shopify.com/s/files/1/0429/9866/1279/files/lopogojuwowigufifakolak.pdf
    • https://cdn.shopify.com/s/files/1/0432/1548/7137/files/arm_blast_workout.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/84026989641.pdf
    • https://cdn.shopify.com/s/files/1/0427/4287/4278/files/best_japanese_drama.pdf
    • https://cdn.shopify.com/s/files/1/0432/1017/8717/files/12551631797.pdf
    • https://cdn.shopify.com/s/files/1/0431/4677/2629/files/65833021698.pdf
    • https://cdn.shopify.com/s/files/1/0432/0893/3540/files/jemivugasiburubijud.pdf
    • https://cdn.shopify.com/s/files/1/0430/8316/9943/files/values_of_playboy_magazines.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_off00004da7.bin
3aa0a3df5dfb06960907d5e2fea777975799dec8dfe283fa681223c2c4968df3
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DA7 5324 bytes
font_01_sfnt_off00005f92.bin
97ef9b0f3b378924146bc4e24e1aedde58ae871d9e27a037c6230847d11ef87d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F92 15300 bytes