Malicious PDF — malware analysis report

Static analysis result for SHA-256 919a762995edda00…

MALICIOUS

PDF

39.7 KB Created: 2020-08-16 13:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3267a324c3b291a4fc7123a919d60c00 SHA-1: fe6b42e51b1d7319f2f4c7d5b9cce95f104c453a SHA-256: 919a762995edda00affa627ab14cb3b14d3e2292eab9bb629c061eb90fc1f787
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The PDF also hosts a large number of external links, many pointing to Shopify domains, which is indicative of a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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=walmart+flannel+sheets+twin+size
    • http://zuduwakij.deewiegand.com/uploads/1/3/2/6/132683071/favujorutatizev_kenoxiligugi_piwupixuras.pdf
    • http://rixoraxo.rivercityfalconclub.org/uploads/1/3/1/4/131437130/wogitarigobadomi.pdf
    • http://files.alchimia.us/uploads/1/3/0/7/130740068/jewamisinaferil.pdf
    • http://tepuz.4u2believe.com/uploads/1/3/0/7/130740051/7903477.pdf
    • https://cdn.shopify.com/s/files/1/0432/2253/2251/files/47720611460.pdf
    • https://cdn.shopify.com/s/files/1/0432/2335/1458/files/96436929752.pdf
    • https://cdn.shopify.com/s/files/1/0429/7018/5879/files/31950046358.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/4098762061.pdf
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/addition_worksheets_for_grade_2_without_regrouping.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1871/files/journaux_algeriens_en.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/zodox.pdf
    • https://cdn.shopify.com/s/files/1/0430/7763/2161/files/diagnostico_ambiental_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0454/0645/3928/files/mojimewudinabiwogamirovo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/toro_snowblower_repair.pdf
    • https://cdn.shopify.com/s/files/1/0429/8683/2035/files/labesanoto.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59526866216.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/12226197943.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_off00005d45.bin
288c500da6765c0692a5b7e5fb42ba4bfd816e1038354a57f539b3a4d7c69658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D45 5160 bytes
font_01_sfnt_off00006ec7.bin
ce063612e2eb6eca5b1de49be12638f3f6c1c9bd916d1044839169ebdb94bda7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC7 10268 bytes

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