Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad51743c8e4f4f67…

MALICIOUS

PDF

38.0 KB Created: 2020-08-30 01:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af0b3faae14149a1be4e75b7a06935c6 SHA-1: 0e91826f6ce4492f3d26f05014cdb2e47d9469af SHA-256: ad51743c8e4f4f673521495dadde7ea55000ccc6eb5ce04880cd5d755a7a3630
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a heuristic firing indicating it's a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=calculo+vectorial+marsden+5ta+edicio'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to this malicious site. The presence of numerous other PDF links, many hosted on Shopify, indicates a potential SEO link farm or a method to disguise the malicious redirector among benign-looking links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=calculo+vectorial+marsden+5ta+edicio
    • https://cdn.shopify.com/s/files/1/0434/4594/4481/files/gundam_battle_gunpla_warfare_reroll_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/7870/3511/files/tpcastt_poetry_analysis_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/4456/9242/files/musetafero.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4049/files/google_chrome_latest_version_2019.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/makozuvidutigabojoguj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4330/files/35120872383.pdf
    • https://cdn.shopify.com/s/files/1/0431/1397/1861/files/78914129832.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6727/files/56182656522.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8919/files/lugogojidifelamijanet.pdf
    • https://cdn.shopify.com/s/files/1/0432/4871/3896/files/90057166562.pdf
    • https://cdn.shopify.com/s/files/1/0429/1821/5847/files/ap_art_history_crash_course.pdf
    • https://cdn.shopify.com/s/files/1/0435/5738/8439/files/89467530539.pdf
    • https://static.usrfiles.com/ugd/a76634_1e952ce78c27431cb0b8109d37decb24.pdf
    • https://static.usrfiles.com/ugd/b8c837_965c8c0373814048ad8d9eb9b11ac205.pdf
    • https://static.usrfiles.com/ugd/913720_2319b261d9474d94bb3b045c23de1516.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_off00005796.bin
f575625607ebb3ea26a5fbc9143f9aec53ab2aec8767654a45219ede03a127bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5796 5176 bytes
font_01_sfnt_off00006922.bin
e6a4f9a1e1d65f15ab92d7fbd79045a3bec6aad0c8450dddbd8868b36e2207a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6922 10020 bytes