Malicious PDF — malware analysis report

Static analysis result for SHA-256 52674d0ef2894e54…

MALICIOUS

PDF

34.6 KB Created: 2020-08-22 22:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6545a7339ca84756151780655169ebd SHA-1: a8486ac913f0dbedd75555ba26db0802ccb2da4a SHA-256: 52674d0ef2894e546d5c1cb9fa0f55d59b94995910eee41665d69f5abbc70fb9
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'free avery template 8160' and the malicious URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious sites via embedded links.

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=free++avery+template+8160
    • http://maxaneji.darcyrylander.com/uploads/1/3/0/7/130776167/dccab89b083.pdf
    • http://files.mrgunsplace.com/uploads/1/3/2/6/132682335/8065015.pdf
    • http://nevagoj.alittlearttherapy.com/uploads/1/3/1/0/131070356/lavajor-tekariweku-nesopibi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3526/1085/files/fiche_pour_apprendre_le_franais.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/90410227590.pdf
    • https://cdn.shopify.com/s/files/1/0437/9970/7805/files/wurekowepa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6009/2309/files/gumepoxinunixutevuzekaju.pdf
    • https://cdn.shopify.com/s/files/1/0440/1001/2837/files/919438458.pdf
    • https://cdn.shopify.com/s/files/1/0428/6929/3223/files/jawaxejusifed.pdf
    • https://cdn.shopify.com/s/files/1/0439/2576/6312/files/gowatusakoxemage.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9544/files/63405210917.pdf
    • https://cdn.shopify.com/s/files/1/0433/9299/1399/files/musuxinasasevor.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_off0000499d.bin
5c2849fcf005301c5483975040ebe10298fa9df26ebb4d53d23bbbd88ae93c5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x499D 5444 bytes
font_01_sfnt_off00005c1d.bin
ae4b496fb85e6daf4546cdc63da031994efe8bde51f87250b52325bacb529610
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1D 9904 bytes