Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d90d6b5c7e95977…

MALICIOUS

PDF

43.4 KB Created: 2020-08-05 11:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f959fbd6fba2cb500b436a5ac07b3961 SHA-1: c2b2e2bfda80972b03735857a2255991752a4d53 SHA-256: 1d90d6b5c7e9597777cca810b0d3af236bd15c3fba0cab2839219b4b88796e95
152 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 pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, suggesting a lure to a malicious site disguised within a seemingly legitimate document.

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=variable+costing+pdf
    • http://files.cerocmedfest.com/uploads/1/3/2/6/132695492/4212825.pdf
    • http://files.theplayfactoryplaygroup.com/uploads/1/3/2/7/132740541/fd4f13d.pdf
    • http://files.armfieldnewsletter.com/uploads/1/3/2/7/132740249/765002.pdf
    • http://files.fumclaredo.org/uploads/1/3/0/9/130969494/levonemafako.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/88910466481.pdf
    • https://cdn.shopify.com/s/files/1/0438/8149/6744/files/xefumatudapemozonimi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8184/9245/files/63069643226.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/dovap.pdf
    • https://cdn.shopify.com/s/files/1/0432/2715/2539/files/2017_nissan_altima_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/potedijomedoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81143567733.pdf
    • https://cdn.shopify.com/s/files/1/0433/1362/7294/files/zubumutipebaruponamujaxav.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/53569600934.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2054/files/exercices_avec_avoir_et_etre_au_present.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32829552166.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_off00005da9.bin
237dfc01b1d344d004efc9bf1e24c03ec2697b297f5daf66813ed2bb3fa0b0ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA9 5216 bytes
font_01_sfnt_off00006f65.bin
ce51513a89bd82af8269f2db0a32bd19ec072f55e64b61732d6ac4e72313f2a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F65 10416 bytes
font_02_sfnt_off0000930d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x930D 4324 bytes

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