Malicious PDF — malware analysis report

Static analysis result for SHA-256 8460a1c7783a74b3…

MALICIOUS

PDF

32.8 KB Created: 2020-09-02 12:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2044660f071a438e49b90f6ac763da33 SHA-1: 66b3e9a759aab2abad03d42ae3bb94fc63a0540e SHA-256: 8460a1c7783a74b3e85d620e5ecd36e260a48f7c7c87b56c35e509deefeb53a3
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text fragments that, when combined with the heuristic firings, suggest a lure for potentially malicious content. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm strategy to obscure the ultimate destination.

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.club/wix?keyword=green+day+songs++free
    • https://cdn.shopify.com/s/files/1/0434/8664/2336/files/38715300280.pdf
    • https://cdn.shopify.com/s/files/1/0434/2913/4487/files/60191330705.pdf
    • https://cdn.shopify.com/s/files/1/0431/5339/1780/files/91508912474.pdf
    • https://cdn.shopify.com/s/files/1/0432/3655/6962/files/34351894692.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ee06d60f0284a798a6b926a51b6b185.pdf
    • https://static.usrfiles.com/ugd/0047a4_6b8b578f72e54a25a31a351cf4902cd7.pdf
    • https://static.usrfiles.com/ugd/3f0e57_4a26387a9de148b6b6d9845b28f073ac.pdf
    • https://static.usrfiles.com/ugd/76de1a_ba9bd7b4829944239f52c601fdfde5c9.pdf
    • https://static.usrfiles.com/ugd/c7a620_abc2c35cc55644f9b672b91c6587f025.pdf
    • https://cdn.shopify.com/s/files/1/0440/6955/2293/files/putexuxokinibapivibif.pdf
    • https://cdn.shopify.com/s/files/1/0449/4072/2331/files/arte_barocca.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_off0000420c.bin
11a7d54e63e4d4fe03b05b46ac34dc6ce1ba4020002971def4388f8d6ed0072f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x420C 5176 bytes
font_01_sfnt_off000053c5.bin
defcbdd6d809cd46111156405555fff356e76db89a5b04a27175272a48ce830a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53C5 10316 bytes

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