Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4653f614d22782…

MALICIOUS

PDF

49.5 KB Created: 2020-08-06 07:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da92da473eb76672e6893aa7fba3dd96 SHA-1: a715284f27e4c9d4d4e76f0451c3f757294b7ec0 SHA-256: fd4653f614d2278298977a1ac66625916a9ed3d73a801b30c441fe4865e7e9b2
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL that is also flagged by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, suggesting the primary intent is to redirect the user to malicious content.

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=1993+aashto+flexible+pavement+structural+design+pdf
    • http://files.mickbrennansabsolutefitness.com/uploads/1/3/2/6/132682787/mirubukajo_lomomuzosam_pused_topiwotev.pdf
    • http://files.cherylmillar.com/uploads/1/3/0/8/130874496/1152727.pdf
    • http://files.biasranch.com/uploads/1/3/1/4/131453684/tafaw.pdf
    • http://files.carolavedonsavage.com/uploads/1/3/0/9/130969656/murevogatono.pdf
    • http://files.homeonthesquare.org/uploads/1/3/1/0/131069789/24dd046e789c.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/business_plan_for_startup_software_company.pdf
    • https://cdn.shopify.com/s/files/1/0429/4747/7667/files/tilaxu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9025/4749/files/apprendre__dessiner_avec_autocad.pdf
    • https://cdn.shopify.com/s/files/1/0431/4690/3701/files/53422917072.pdf
    • https://cdn.shopify.com/s/files/1/0435/2334/2495/files/63363226861.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2779/files/bojabif.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/101_anti_aging_foods.pdf
    • https://cdn.shopify.com/s/files/1/0432/2518/6466/files/31482083008.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8646/files/dupikax.pdf
    • https://cdn.shopify.com/s/files/1/0432/3613/0983/files/50999369635.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/30768564357.pdf
    • https://cdn.shopify.com/s/files/1/0431/2986/4343/files/bepikekojakujax.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_off00008101.bin
5ff2442a20bff2637ab1e09264cdc1b843a65ebe2aac5cd64ec13fd0329d704a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8101 6116 bytes
font_01_sfnt_off000095b2.bin
c3ccf65a74b8bf135c684acf96c8e8fbbb116aa5402d5159c2b6a437ea03a989
pdf-font-stream PDF embedded font (sfnt) at offset 0x95B2 10160 bytes