Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a2ae61c5f72f54…

MALICIOUS

PDF

42.6 KB Created: 2020-08-25 22:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5685ed3c001e0e9d35fa8cb0ec78c93 SHA-1: a51c5e203087837e7ee2cd71d1c20c5e663bf5cd SHA-256: 07a2ae61c5f72f5439c91835725b98de6dfa9f36111dc58033ddf3d6ca14df3c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to 'safety symbols worksheet' and includes a URL pointing to a redirector. The presence of many external links, including those to Shopify, suggests an attempt to distribute malicious content or engage in SEO link farming.

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.com/pify?keyword=safety+symbols+worksheet
    • http://dubupoz.carawaydeafyouth.com/uploads/1/3/1/8/131871390/9216987.pdf
    • http://vagusiwaj.roomsrevamped.com/uploads/1/3/1/3/131380582/4336028.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/5056/3734/files/13290992985.pdf
    • https://cdn.shopify.com/s/files/1/0429/6635/2025/files/49501719738.pdf
    • https://cdn.shopify.com/s/files/1/0437/5969/8077/files/97256912832.pdf
    • https://cdn.shopify.com/s/files/1/0449/8666/3070/files/bringing_up_bebe_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6249/files/va_forms_4138.pdf
    • https://cdn.shopify.com/s/files/1/0439/1020/1499/files/concept_of_entrepreneurship_skills.pdf
    • https://cdn.shopify.com/s/files/1/0433/5114/6649/files/82711127508.pdf
    • https://cdn.shopify.com/s/files/1/0441/2047/3752/files/26843308378.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/gimupikefixipu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/16989705064.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/atomistique_et_liaison_chimique_l1.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_off00006863.bin
bbda2aea704936b12dc50ef1c53c265e39d356cdbf462ca55c0b1e60b2faf5ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x6863 5508 bytes
font_01_sfnt_off00007b13.bin
925173d811ebde6471791e31f39d83dc807195a084ed0b3416018e060d7405f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B13 10192 bytes