Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b57e9c15af90ce3…

MALICIOUS

PDF

42.9 KB Created: 2020-08-23 10:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5d12e3dd5d202e1fdc06db9bcd50042 SHA-1: 9ef6fd86343805c2c5a8399f57f52fc13d311291 SHA-256: 3b57e9c15af90ce38b6060066cc3933a2b3c9af6789ffc4370fd0abd9973a243
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that is disguised as a study guide. The link leads to 'ttraff.cc', which is known malicious infrastructure. The document body also contains numerous links to PDFs hosted on various domains, suggesting a link farm for SEO manipulation or to distribute further malicious content. No scripts were extracted from this sample, limiting the analysis of its direct execution behavior.

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=best+asvab+study+guide+book
    • http://files.geocrimella.com/uploads/1/3/0/7/130776589/jokemaserawa_vigeduzigap_zipitariba_xewafekuzipo.pdf
    • http://files.guilfordfoodbank.org/uploads/1/3/0/7/130739253/9228e3.pdf
    • http://files.electricscooterrentalorlando.com/uploads/1/3/1/3/131398125/sabene.pdf
    • http://gakonam.movingsoundscape.com/uploads/1/3/0/7/130738714/6438172.pdf
    • http://files.breakalegman.com/uploads/1/3/1/4/131437413/bawupujewewo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6725/files/70794967597.pdf
    • https://cdn.shopify.com/s/files/1/0435/5407/8871/files/vatepasurosuzaxanaburi.pdf
    • https://cdn.shopify.com/s/files/1/0443/9130/1286/files/apdcl_advertisement.pdf
    • https://cdn.shopify.com/s/files/1/0438/9657/0024/files/12241994648.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/wapadopijenos.pdf
    • https://cdn.shopify.com/s/files/1/0430/3021/6855/files/50046172263.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/40190242498.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/alhambra_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0427/7318/4678/files/jogozefemupumipopo.pdf
    • https://cdn.shopify.com/s/files/1/0439/1262/6344/files/fedepolameruxepa.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/
    • https://cdn.shopify.com/s/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a3a.bin
1a68637527423ed46d1c91eeaf15e44f088632c56dc277b552bbfea233798058
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3A 5280 bytes
font_01_sfnt_off00007c4f.bin
96cfb11cf0278237d6416279d9fc4f80ec692b0c5221a11dd58841d8057fd15e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4F 10068 bytes