Malicious PDF — malware analysis report

Static analysis result for SHA-256 139a8de2496613d3…

MALICIOUS

PDF

56.7 KB Created: 2020-08-28 13:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a763b42a756155689fb7efc705756e3 SHA-1: ae6a74391e22e92a3ce0b235774cfbddd2e88575 SHA-256: 139a8de2496613d393d9eea7381a9d9d399d590216f96c3cff767490ce4fc54d
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL associated with a known redirector. The document body, though heavily obfuscated, contains a reference to the same malicious URL, suggesting an attempt to lure the user to a compromised site. The ML classifier also 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.ru/pify?keyword=knife+fighting+techniques
    • http://fafux.letsrockandrollandchangetheworld.org/uploads/1/3/1/3/131398020/9778624.pdf
    • http://files.homesimpledenver.com/uploads/1/3/1/0/131070918/wifegugewixogu_nabawe_divojijarib_bafufad.pdf
    • http://files.ndpharmabiotech.net/uploads/1/3/2/7/132712413/7424128.pdf
    • http://files.klodtap.com/uploads/1/3/0/7/130775635/6b6a5329d5c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0990/8637/files/559923280.pdf
    • https://cdn.shopify.com/s/files/1/0460/8144/1956/files/.pdf_7c2f992f-86f0-400c-bce3-842e4bc12597
    • https://cdn.shopify.com/s/files/1/0437/5035/9194/files/berghaus_jackets_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/0667/1517/files/hndlagde_treleker_bter.pdf
    • https://cdn.shopify.com/s/files/1/0428/2299/2028/files/latest_south_african_hip_hop_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/9090/2166/files/rafanudo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/adventure_time_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0434/4184/8470/files/kiwujobisajur.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3969/files/guromuzamudajer.pdf
    • https://cdn.shopify.com/s/files/1/0437/1991/7720/files/80304499724.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/almidon_en_heces.pdf
    • https://cdn.shopify.com/s/files/1/0433/3263/2730/files/70574381658.pdf
    • https://cdn.shopify.com/s/files/1/0432/8072/8224/files/budez.pdf
    • https://cdn.shopify.com/s/files/1/0430/5593/9733/files/48400635400.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/pedoximeko.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_off0000a1c8.bin
3bcf5ea92d82dc1ccad1b0ccddf32664dfcfe397143b92ac79fd32a004943787		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1C8 4900 bytes
font_01_sfnt_off0000b280.bin
9cd8ea690b4a0186d7236263665fa9d9d4d60f4a0ae29fa222a443192cbb5e66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB280 10324 bytes

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