Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c08b3fa2ed064ed…

MALICIOUS

PDF

44.2 KB Created: 2020-08-15 01:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e73ed9c34e1f39c39e5b1e0cd241192d SHA-1: 775a87f9d1adf2f4f4fbf05b6ed3b39cf0d40d76 SHA-256: 9c08b3fa2ed064ed9ab9dbd0b06a1170a026e93ff0a337e7768ad864d73d3214
154 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 a 'Ryze toplane guide'. This indicates a likely phishing or malware distribution attempt. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive document title and a malicious link.

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=ryze+toplane+guide
    • http://files.sweetheartbakeryonline.ca/uploads/1/3/2/6/132680901/mixeso.pdf
    • http://files.torbayvts.com/uploads/1/3/2/6/132681479/661489.pdf
    • http://fefaj.naturalfeetfootzonology.com/uploads/1/3/0/7/130739625/nikezifure_fazamemumaf_xeginagulokiso_sasebisumazoja.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/affiches_parisiennes.pdf
    • https://cdn.shopify.com/s/files/1/0434/2064/7576/files/974695148.pdf
    • https://cdn.shopify.com/s/files/1/0429/2440/8988/files/71299948500.pdf
    • https://cdn.shopify.com/s/files/1/0439/2009/7448/files/kumezokija.pdf
    • https://cdn.shopify.com/s/files/1/0437/4337/9617/files/scanned_to_word_editable_online.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3204/files/pogudedelibuned.pdf
    • https://cdn.shopify.com/s/files/1/0433/4069/3662/files/skyrim_ps3_mods.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/kunikekurejuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/97391396265.pdf
    • https://cdn.shopify.com/s/files/1/0438/1809/0653/files/75288112029.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/convert_scanned_into_word_online.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/dikux.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_off00006525.bin
e4cb71fd661d3ef01ab17e29a71d20cd995d9b24b4de2f6c28e359d248c7e27f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6525 5012 bytes
font_01_sfnt_off00007658.bin
b66773099b6bc1878a382612082cdbe1dfaa7d7d3b78ab3097aefaae2ca03ee9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7658 14508 bytes