Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa10ea9e0a28b4a…

MALICIOUS

PDF

46.0 KB Created: 2020-08-17 18:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90b6298d4cfe53f664e3021299da506a SHA-1: a43b524442b6e2d59cf436f9b8224d9e8f580054 SHA-256: 0fa10ea9e0a28b4a08ac5375dcc84bffcfc9b46e42fdf5b05e7b414b208f85a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=south+african+business+plan+template+pdf'. The document body, though heavily obfuscated, contains references to business plans and URLs, reinforcing the lure. The ML classifier strongly indicated maliciousness.

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=south+african+business+plan+template+pdf
    • http://files.elkhartcountycovid19.com/uploads/1/3/1/1/131164205/8514947.pdf
    • http://files.esan-network.co.uk/uploads/1/3/2/6/132696465/8247721.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/94615969090.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/76212772070.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6665/files/devil_in_i_tab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wonazonuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/1860/0095/files/bubifojimavalimevogelelul.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6725/files/tixudozam.pdf
    • https://cdn.shopify.com/s/files/1/0439/4749/1486/files/bodoland_lottery_result_today.pdf
    • https://cdn.shopify.com/s/files/1/0434/6504/8229/files/alzheimer_unam.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1395/files/jipebuvowemobotikofir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068b3.bin
2d1b4e2e113955002e974a1ed33854648521511436df0045cf33290630a3eb2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x68B3 5520 bytes
font_01_sfnt_off00007b37.bin
e7392809d6bb48ad9f3f201c2a4f4d4d96d9b4cec68f9b18371ca39745f0db34
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B37 10016 bytes
font_02_sfnt_off00009d57.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D57 4324 bytes