Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b0bbfbe3084c1d…

MALICIOUS

PDF

48.6 KB Created: 2020-08-20 04:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d55e01f2a16448b918fd0bfbb11b3b0c SHA-1: 920ca1f6f7c18ceb9f27506d3c563c1fe701e03a SHA-256: f3b0bbfbe3084c1da772ff88acbe522555e2bcef88e913b3869afb85444e307a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, many pointing to a redirector service (ttraff.com) which is flagged as malicious. The document body, though garbled, contains the same URL, suggesting it's the primary lure. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the link farm and redirector indicate a likely phishing or malware distribution attempt.

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=background+flower+vector+free
    • http://files.journeyoftrust.net/uploads/1/3/1/3/131380343/4971448.pdf
    • http://lavadukul.tidytimeservices.com/uploads/1/3/2/6/132680981/5344373.pdf
    • http://ximines.learningexchanges.org/uploads/1/3/0/7/130775565/9604509.pdf
    • http://files.pyrographystore.com/uploads/1/3/1/6/131606965/dd8a30c1e918.pdf
    • http://ririzi.eatcheap-eatwell.com/uploads/1/3/0/9/130969060/3155321.pdf
    • https://cdn.shopify.com/s/files/1/0439/4886/7742/files/bcit_map.pdf
    • https://cdn.shopify.com/s/files/1/0437/9679/1456/files/59665545070.pdf
    • https://cdn.shopify.com/s/files/1/0430/7219/2669/files/3120984180.pdf
    • https://cdn.shopify.com/s/files/1/0428/0467/4727/files/rerekeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/3512/2081/files/mazobeneporewijemiwatifa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5353/1807/files/74742572311.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1288/files/sho_oulth_horror_of_oryx_mars.pdf
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/91416643404.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupuxisupevijerabufogete.pdf
    • https://cdn.shopify.com/s/files/1/0431/5833/9733/files/alphabet_lettering_template.pdf
    • https://cdn.shopify.com/s/files/1/0436/3524/5216/files/avantages_de_l_allaitement_maternel_exclusif.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_off0000757e.bin
3d768bef3480b182f3f371bd4e2f10a2b89f1cd1e279535df6f347e7baa879d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x757E 5112 bytes
font_01_sfnt_off00008707.bin
c43e209736f5b6b9a8f97338bdc093468ab8ac320305bdd3217528f55af3153e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8707 9504 bytes
font_02_sfnt_off0000a76d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA76D 4324 bytes

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