Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35fe57294d11112…

MALICIOUS

PDF

49.4 KB Created: 2020-08-18 16:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef053031bbed7066bb206a4af21ad4a5 SHA-1: ae034bfc952ba87981df6c3c3eb9a9bbf03845ee SHA-256: c35fe57294d11112bf913da3a8c1551e1fecd6401ad5559a60a47b6523b9654a
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. This link points to a URL that appears to be part of a link farm, with many other PDFs hosted on Shopify. The document body contains the redirector URL and several other PDF URLs, suggesting a campaign to distribute malicious content or engage in SEO poisoning. No scripts were extracted, but the structure and embedded links strongly indicate a malicious intent to redirect users.

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=brolly+sheet+nz
    • http://files.cornhoartist.com/uploads/1/3/1/4/131409498/4701337.pdf
    • http://files.wavehogsurfshop.com/uploads/1/3/1/1/131163601/terikefejidibe.pdf
    • http://zedurit.arideisland.com/uploads/1/3/1/6/131637257/6756444.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/tifetisovudozarapudafolo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1547/0245/files/27800355556.pdf
    • https://cdn.shopify.com/s/files/1/0429/2873/4375/files/95145836135.pdf
    • https://cdn.shopify.com/s/files/1/0431/8930/5501/files/descriptive_grammar_of_pashto_and_its_dialects.pdf
    • https://cdn.shopify.com/s/files/1/0447/4689/9607/files/stewart_calculus_8th_edition_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/3507183712.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1695/files/automobile_companies_in_pune_list.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/60689343326.pdf
    • https://cdn.shopify.com/s/files/1/0431/5676/6882/files/30127725211.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1097/files/etcd_vs_consul.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_off00007bc2.bin
10c25095593a97226d91e2e93ec2bb34b6b1985a673e2f9f4cd8c65e1f90cd5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC2 4764 bytes
font_01_sfnt_off00008c01.bin
8340b98b686287002cecdb31f756b04a6ec48065dac0b18814962db653edf982
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C01 14264 bytes