Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f2b17efde6a35a…

MALICIOUS

PDF

48.0 KB Created: 2020-08-06 12:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a05e988b6b4b1a9c7f88e25c661c39e1 SHA-1: f7b5ab0ce215768d3457fd000e16a118bff3eb5e SHA-256: 13f2b17efde6a35aa76826e58660874e27073ee4efc41a508338cb1a22498502
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.ru'. This suggests the document is designed to lead users to malicious sites, likely for phishing or malware distribution. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO manipulation or distributing malicious content.

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=basic+vietnamese+phrases+pdf
    • http://files.caravancreative.org/uploads/1/3/2/6/132682542/e788d.pdf
    • http://files.dianabranisteanu.com/uploads/1/3/0/8/130815026/c761651139f.pdf
    • http://files.ldowingslaw.com/uploads/1/3/2/6/132680808/xagonoku-jerekokika-somufuvukakak-detotokibax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/6443/3566/files/29255819051.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/37604868145.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/6620307971.pdf
    • https://cdn.shopify.com/s/files/1/0429/9292/6883/files/77493137018.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/44948716433.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9332/files/dinakuxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/vojemug.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7511/files/17179708908.pdf
    • https://cdn.shopify.com/s/files/1/0433/6015/7855/files/lejavanefaluke.pdf
    • https://cdn.shopify.com/s/files/1/0430/1720/7971/files/formation_catia_v5_surfacique.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7525/files/28713003481.pdf
    • https://cdn.shopify.com/s/files/1/0428/1945/3095/files/phillies_schedule_2020.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_off00006aa5.bin
70392bc498539570f6b3757cfb600ac4f208f2f8f1b56bea01edfd6ac52a8cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA5 5148 bytes
font_01_sfnt_off00007bf0.bin
1e6633e4400cffcd63ff0daef652f0b7d96863b0f749a3315403cf07c580539b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF0 14516 bytes
font_02_sfnt_off0000a505.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA505 4324 bytes

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