Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b54f4fe84c1153…

MALICIOUS

PDF

44.2 KB Created: 2020-08-07 09:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f73be829c6e5f83c895689d68742ee12 SHA-1: 9320285f531045bec822aef0927f7b81eb914fd9 SHA-256: 40b54f4fe84c1153f875d9a8987cdefa20d9ec0d6f11662483ceb4e736774e76
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic. The presence of numerous embedded URLs, many pointing to Shopify, suggests a link farm designed to obscure the ultimate destination. The primary malicious IOC is the redirector URL, which likely serves as a gateway to a phishing or malware delivery page.

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=cefalea+hemicranea+paroxistica+pdf
    • http://files.rochesterphoenixmartialarts.com/uploads/1/3/1/4/131453354/77ee6.pdf
    • http://lesopiv.relationaltransformation.org/uploads/1/3/2/6/132681556/dcdee4.pdf
    • http://files.aboutta2s.com/uploads/1/3/1/3/131380183/7207864.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9138/files/32000939063.pdf
    • https://cdn.shopify.com/s/files/1/0429/1179/3315/files/nomatirodevu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/bopapexokaduken.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78578063821.pdf
    • https://cdn.shopify.com/s/files/1/0428/6906/3836/files/15945682939.pdf
    • https://cdn.shopify.com/s/files/1/0432/4645/2899/files/lugojodujibes.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0887/files/dotebuvamapaxebi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/40500002184.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/7608828522.pdf
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/lilofo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1061/files/dovopoxomunukizuvuva.pdf
    • https://cdn.shopify.com/s/files/1/0432/5300/6494/files/jamar.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_off00006ff6.bin
282b0ec191d7ff8dfc7e623c9da4b96a4236c7cc63ae6850297ee9a4d26338cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF6 5368 bytes
font_01_sfnt_off0000820d.bin
bc99892ad0e1e3c1e3a34824a718a1085a7124792d5a318ec99a8a18d433106f
pdf-font-stream PDF embedded font (sfnt) at offset 0x820D 9992 bytes