Malicious PDF — malware analysis report

Static analysis result for SHA-256 5381c0fd40cfac8f…

MALICIOUS

PDF

42.8 KB Created: 2020-08-06 13:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bb3f16bc3ce8a405b518181aed79f0a SHA-1: 30d563a49a345b88ee047a8bfd0be7d530837b15 SHA-256: 5381c0fd40cfac8f35f25f400425206755ae1498a71746aa0957b3eb3a055b35
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document body text, though garbled, includes the URL and suggests a lure related to 'find command in unix pdf'. The presence of numerous external links, many pointing to Shopify domains hosting other PDFs, indicates a link farm strategy to improve search engine ranking and distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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=find+command+in+unix+pdf
    • http://files.juliarix.com/uploads/1/3/1/3/131398094/muxuweke.pdf
    • http://files.flindersislandrunning.org/uploads/1/3/1/4/131437064/1729054.pdf
    • http://files.laughalotpaintandsip.com/uploads/1/3/1/4/131437736/gezusedovigijo_razowalo_poxawom_fanapiv.pdf
    • http://files.amandajanedavies.com/uploads/1/3/1/6/131606984/ab4e83417243d6.pdf
    • http://kilov.angelhawariart.com/uploads/1/3/1/0/131070581/kekare_natakovejuku_vuleperodinipo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/worefigobatide.pdf
    • https://cdn.shopify.com/s/files/1/0440/6879/8614/files/48267348490.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/99663564814.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5271/files/banuma.pdf
    • https://cdn.shopify.com/s/files/1/0437/2529/1671/files/xigomoxewaxobel.pdf
    • https://cdn.shopify.com/s/files/1/0433/8250/5628/files/statistical_analysis_in_simple_steps_using_r.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/notoxumibabinidalizumazu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/vubub.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/82545560257.pdf
    • https://cdn.shopify.com/s/files/1/0435/2845/4298/files/felumitowesujor.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_off00006a20.bin
4eb8091d37ce81613fee6955a35624d522d81ef330c1a9cafaf9891acc8c448f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A20 5016 bytes
font_01_sfnt_off00007b2c.bin
6b35244041e997fbd55c8815376c81692febb7bde09475b403e7cd078fd2c159		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B2C 10260 bytes

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