Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e813ab719b5ddfa…

MALICIOUS

PDF

51.5 KB Created: 2020-08-14 16:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d0b945dbbf0498bb4ae42c2104a03ab SHA-1: 5e0518d19e4e1cda97e30cb80d16cd6dc9655294 SHA-256: 6e813ab719b5ddfa41b80b4ccf0623e24c61b80080fe898c6e82f0380f48bb30
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, suggesting an attempt to lure the user to a malicious site. The document body, though heavily obfuscated, contains embedded URLs that are part of a link farm, indicating a potential SEO poisoning or spamming campaign. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment of malicious intent.

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=battletech+pc+game+guide
    • http://files.coonrodgirls.com/uploads/1/3/0/7/130739318/jadepetirasu.pdf
    • http://files.josestrela.com/uploads/1/3/1/4/131406751/334524.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/9001/6424/files/algorithms_for_dummies_github.pdf
    • https://cdn.shopify.com/s/files/1/0429/0750/0711/files/96035921703.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2581/files/waxoxafonazubo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8151/2613/files/jodebivapolefije.pdf
    • https://cdn.shopify.com/s/files/1/0440/6480/0918/files/55285127471.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/mijikavupafokutigugituj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3760/5544/files/51737440778.pdf
    • https://cdn.shopify.com/s/files/1/0431/4290/6007/files/atm_card_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/7080/7461/files/ceebook_answer_net_2019.pdf
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/6251169272.pdf
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/marketing_concepts_and_strategies_dibb.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_off00008c30.bin
3e4fe556927ababa02cc7da82a2820240c3cccd014ebf41edef5d7aa58108089
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C30 5264 bytes
font_01_sfnt_off00009df7.bin
3c77976bc8f5d43f02c73e74ec3744dc5bc1ba4663527e446667d9d16c2e7056
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DF7 10420 bytes