Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a437692aa4d4f7…

MALICIOUS

PDF

44.4 KB Created: 2020-08-19 05:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 082563ee5165683c167d0496abc7a580 SHA-1: 5732251fd5cfbf2d708563b6e3359b9842b36589 SHA-256: 69a437692aa4d4f740459343bcc022777979f8a8361f8e40e435fd76cd09361a
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, specifically a link related to 'linkedin my profile picture'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains the same lure and URLs, suggesting an attempt to trick users into clicking malicious links for credential harvesting or further malware delivery.

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=linkedin++my+profile+picture
    • http://sefuxud.electricrailwayclubsflorida.com/uploads/1/3/1/8/131856584/ed4bd6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9167/1705/files/terat.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/2003_cadillac_deville_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/81413664169.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/jararukerabasoxeloje.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/armani_underwear_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/5582/3525/files/sozadezubanibivijowepol.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/wobajabokebuzibife.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1125/files/53651912305.pdf
    • https://cdn.shopify.com/s/files/1/0428/6844/1254/files/86166984893.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5993/files/fungal_pneumonia_guidelines.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_off00006fee.bin
b4af940a01e4cdf9b7d16d68dd679fe48987268c5b71261e8b93cc4c9cfc265b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEE 5020 bytes
font_01_sfnt_off000080f4.bin
3d91b476de6a85f461d9f5d98b9a8fd4e789a38368ecc5392fa059b302f463ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x80F4 10604 bytes