Malicious PDF — malware analysis report

Static analysis result for SHA-256 7adf48755fe23dfe…

MALICIOUS

PDF

42.9 KB Created: 2020-08-24 01:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bf4b5cb1c3984d74cad22c0080e535e SHA-1: d44af38710274898e6f2985fa3d058d904ea88cd SHA-256: 7adf48755fe23dfe24710dac9557714cefba776deed43a1d6a889a87088406d3
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same URL and other links that appear to be part of a link farm designed to improve SEO for malicious content. 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=birthday+wishes+for+husband+song
    • http://files.englishin6months.com/uploads/1/3/1/4/131453329/9e92b1edf7f12.pdf
    • http://files.katyitter.com/uploads/1/3/1/4/131438313/relotufimowemuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3488/5789/files/97694582079.pdf
    • https://cdn.shopify.com/s/files/1/0434/9699/7030/files/wesopokezenabugisimunot.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/lofopexikepasivitix.pdf
    • https://cdn.shopify.com/s/files/1/0464/7596/8662/files/esl_expressing_likes_and_dislikes_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/wodob.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/vemimemezizixonakig.pdf
    • https://cdn.shopify.com/s/files/1/0430/2707/1127/files/rojudigetivuvironitanoli.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79086372433.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2470/files/41666895714.pdf
    • https://cdn.shopify.com/s/files/1/0432/3626/2052/files/abaqus_theory_manual_6._14.pdf
    • https://cdn.shopify.com/s/files/1/0431/8062/1984/files/mage_tower_guides.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_off00006873.bin
b2961a1afc26bd505094a170d0b4727e1adccc221e75ea8db94ba70eab8cda66
pdf-font-stream PDF embedded font (sfnt) at offset 0x6873 5520 bytes
font_01_sfnt_off00007b4c.bin
dda025c82e79393a98b0900eb85631a1476d5d967aea8f677790ad9ecd81f8b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4C 10316 bytes