Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f0caf9ef1d20ef…

MALICIOUS

PDF

43.4 KB Created: 2020-08-14 08:39:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4961c06de4457376d93512bafec6e1b9 SHA-1: 96c75cdfc8577567c6bfc058b9e3ca406775472d SHA-256: 74f0caf9ef1d20ef48efc317d78e6e681e3216cd99b9b14dc1f01e784919e471
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, which are likely part of an SEO poisoning or link farm scheme. One of the primary links, https://ttraff.ru/pify?keyword=mobile+train+ticket+booking+app, is identified as a malicious redirector. 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=mobile+train+ticket+booking+app
    • http://files.jiaweitay.com/uploads/1/3/2/7/132740285/sonefikosixuxaviv.pdf
    • http://files.assemblyofgeeks.com/uploads/1/3/1/6/131636651/6241108.pdf
    • http://files.scallowaymuseum.org/uploads/1/3/1/4/131453919/120bdb76.pdf
    • http://files.adrayer.com/uploads/1/3/2/7/132710689/zitesosi-xomaniwovon-labemelarujin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/foduguvexulonelu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33971068516.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/koripupulisupu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/87778404878.pdf
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/bawewatoluxetokavexogo.pdf
    • https://cdn.shopify.com/s/files/1/0439/3140/2395/files/13052089613.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8951/files/55983580670.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2116/files/52111198056.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/73075384568.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/39842347798.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/leraxekemikumesub.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/carotid_stenosis_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0432/7361/7576/files/85812062782.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_off00006c3c.bin
95ecdfca67dc85b686e6c9fe00559f33fd1aff5a0cebda4f7cb6d0c3af9636da
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3C 5132 bytes
font_01_sfnt_off00007dc5.bin
2de4997d622b0385abb270fe4f65eeadc5cab30908ee0164cc448f0c19cb4701
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC5 9736 bytes