Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc591fe43f57e4a9…

MALICIOUS

PDF

49.2 KB Created: 2020-08-05 11:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b670938cc459041749116d9291275b3 SHA-1: b9f42067fbe7f7dff3f2e8eaf7b5c27e16ad4a41 SHA-256: fc591fe43f57e4a90d68be282e79076ffaaa3d4b2c36a33db8bb8a318bed9668
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify, likely to obscure the malicious destination. The ML classifier strongly indicates maliciousness.

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=general+anesthesia+in+pediatric+dentistry+pdf
    • http://files.castironbrighton.com/uploads/1/3/0/7/130740524/9558521.pdf
    • http://files.seatrunks.com/uploads/1/3/0/8/130814209/foben_gepezaledujig.pdf
    • http://files.bryanadavenport.com/uploads/1/3/1/3/131398498/4c1fe46c6a9dc.pdf
    • https://cdn.shopify.com/s/files/1/0431/8068/7524/files/55397159103.pdf
    • https://cdn.shopify.com/s/files/1/0433/0160/1444/files/50102226821.pdf
    • https://cdn.shopify.com/s/files/1/0433/9823/4270/files/56106193567.pdf
    • https://cdn.shopify.com/s/files/1/0430/8746/2551/files/effects_of_globalisation_on_developing_countries.pdf
    • https://cdn.shopify.com/s/files/1/0437/6897/1418/files/20304414770.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/5029259731.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pizegavegip.pdf
    • https://cdn.shopify.com/s/files/1/0440/2796/9686/files/43377212562.pdf
    • https://cdn.shopify.com/s/files/1/0438/1320/8224/files/auto_spare_parts_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0441/4350/9656/files/encoding_and_decoding_huffman_code_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/kuwodudomevegega.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7202/7814/files/pifukepaloramoxokapu.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/
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/5029259731

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082f3.bin
bbd7890c50a1d606e3d6761499d353c1bd80cc0ed6c7b8b95390ce12e565c6a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F3 5376 bytes
font_01_sfnt_off0000953e.bin
8054a84c330290bd3f7cee0e8bc88a026e2d116fe9e96454ba73c3af8d9a9849		 pdf-font-stream PDF embedded font (sfnt) at offset 0x953E 10076 bytes

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