Malicious PDF — malware analysis report

Static analysis result for SHA-256 a131357f8b294cc0…

MALICIOUS

PDF

53.6 KB Created: 2020-08-12 13:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f9142d7639a4fed56dc8b12dda81848 SHA-1: a40b6524491bf9ebbf0512528fd7fa0d6b0ba50a SHA-256: a131357f8b294cc08e2388ea9913fa5c75282b2e2383d1cf08d897a80081c86b
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a primary link to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'behavioral theory of depression pdf'. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm designed for SEO manipulation. The primary malicious URL is https://ttraff.com/pify?keyword=behavioral+theory+of+depression+pdf, which likely leads to further malicious content.

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=behavioral+theory+of+depression+pdf
    • http://funifej.themilkshed-devon.com/uploads/1/3/1/0/131070450/zagufamaza.pdf
    • http://files.charliehempseed.com/uploads/1/3/0/7/130738565/7803061.pdf
    • http://vuvaxaxu.tarynartistry.com/uploads/1/3/0/7/130775531/98ffb.pdf
    • http://files.stocktonkendodojo.com/uploads/1/3/0/9/130969160/e2d583d1.pdf
    • https://cdn.shopify.com/s/files/1/0433/9410/5509/files/lufipevoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4980/files/jowokofusodagalap.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/21759062421.pdf
    • https://cdn.shopify.com/s/files/1/0430/8339/9329/files/23869835824.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/zixefovujuzugizepami.pdf
    • https://cdn.shopify.com/s/files/1/0429/4252/9695/files/59150705731.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6690/files/atlas_de_microbiologia_clnica.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/80410255925.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/77586747337.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/factors_determining_price_elasticity_of_demand.pdf
    • https://cdn.shopify.com/s/files/1/0435/4247/9007/files/cascade_control.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/mevixusasu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/gapumolaziva.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008721.bin
33dba489e847891d730dc2a8e5d214bba35dd8c67343a884e403d60d978fea3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8721 5128 bytes
font_01_sfnt_off00009899.bin
9487d10e06a2ee1b9a266c83eaaa04715569f965703fcebf33b977f8f6f9d0e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9899 10012 bytes
font_02_sfnt_off0000baeb.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEB 4324 bytes

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