Malicious PDF — malware analysis report

Static analysis result for SHA-256 854cf37d9f387592…

MALICIOUS

PDF

40.1 KB Created: 2020-08-30 11:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a361c8ca406053285dc95a893c53910 SHA-1: 63a460ac5da8d75675dd6c58167e89f9d779a813 SHA-256: 854cf37d9f387592d8728a6d261abd108018a734210dff449d5b857dc2fca47e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector URL, which is a common tactic for distributing malware or phishing pages. The heuristic firings indicate the PDF is designed as a link farm, likely to obscure the true malicious destination. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to trick the user into downloading further content, potentially a second-stage payload.

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/wix?keyword=civil+war+a+nation+divided+pc+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8267/0485/files/gigosefurawuxemokuzo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xibazukikamemawamiwemin.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/47644746978.pdf
    • https://cdn.shopify.com/s/files/1/0433/0471/4404/files/reading_comprehension_toefl_practice.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/41056399846.pdf
    • https://cdn.shopify.com/s/files/1/0429/3361/6803/files/axiomatic_greg_egan.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8cb7da0ef3f4a4dab8a47c7576dcc1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_80aecbb1ed024a25a680bbeac7b79734.pdf
    • https://static.usrfiles.com/ugd/3eed2b_a296f835c27645aa818d55268a7308f0.pdf
    • https://cdn.shopify.com/s/files/1/0430/1013/0073/files/kajuvil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/2020_ashrae_applications_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/zunojir.pdf
    • https://cdn.shopify.com/s/files/1/0438/1281/5008/files/physical_security_access_control.pdf
    • https://cdn.shopify.com/s/files/1/0438/4092/9957/files/samsung_refrigerator_repair_manual.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_off00005fe6.bin
f639ad561dbaa511f9c52064272c4d7d363514e7ba71adb53f55d45066153737
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE6 4944 bytes
font_01_sfnt_off000070da.bin
87777903eb317b4f099709af93c6dc8445cbe340ae5c0b65205ba74a0fff29e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x70DA 10392 bytes