Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d26446e7577544b…

MALICIOUS

PDF

43.2 KB Created: 2020-08-18 21:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6181953637a854a15bef00fdfded99c3 SHA-1: 7718e5175db1887ccc6c0e1ed005d96d2fa1bf39 SHA-256: 7d26446e7577544bc992ab3925260167ab902cda52e51b0b43e64dff0393b354
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. The primary link, 'latex developer cv template', leads to 'https://ttraff.ru/pify?keyword=latex+developer+cv+template', which is flagged as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be a lure for users to click on the embedded links.

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=latex+developer+cv+template
    • http://files.grapeofthevinegoatmilksoap.com/uploads/1/3/2/6/132695829/gudoli.pdf
    • http://sizogum.johnandmorgana.com/uploads/1/3/1/1/131164462/4dde878836629.pdf
    • http://files.stephanieespinal.com/uploads/1/3/1/0/131070718/37eee5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3449/9479/files/minecraft_chat_colors.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/jorivajorokojulezajadim.pdf
    • https://cdn.shopify.com/s/files/1/0431/3330/4981/files/jeligiwigutojatafodisora.pdf
    • https://cdn.shopify.com/s/files/1/0432/7748/4196/files/ryobi_cs26_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6749/8911/files/3971109347.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4642/files/9769787942.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/talijofazejodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3972/7509/files/low_carb_fruits_and_vegetables.pdf
    • https://cdn.shopify.com/s/files/1/0429/3728/6812/files/51402788117.pdf
    • https://cdn.shopify.com/s/files/1/0433/8253/8403/files/biworesovuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/8416/9894/files/16419973563.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/kevitiginetidu.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_off00006aae.bin
13fe0609cf55d41e135611a1c0e89ae106baeea32917648ce37a90f883d49812
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAE 5108 bytes
font_01_sfnt_off00007c00.bin
3b31dd317f36fa74764aae1d51313085b14084642ec1fbb06b9236db179cb7ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C00 10516 bytes