Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7e31f142092c31…

MALICIOUS

PDF

41.0 KB Created: 2020-08-18 19:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfcf67ad02ce811aa8733c0f3cadb92e SHA-1: 34fde6100023136ba282598be0249e71ab69c6e8 SHA-256: da7e31f142092c312b8e217def5d01a371100f68dc2cd36dbab3249e54994463
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=kindergarten+worksheets+science'. Another critical heuristic indicates a PDF link farm, with many links pointing to Shopify domains, likely for SEO manipulation or to host further malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=kindergarten+worksheets+science
    • http://dalugovu.clickfourhelp.org/uploads/1/3/1/4/131406121/3552093.pdf
    • http://files.929clothing.com/uploads/1/3/2/7/132740598/mugujunagadiv-satidurakopizu.pdf
    • http://files.generationsantiquesandmore.com/uploads/1/3/2/6/132681672/bigasip_solerasax_bawigatakafo.pdf
    • http://files.genarospizza.com/uploads/1/3/0/7/130775859/6e671e4b7e7ca14.pdf
    • http://sokex.wflta.com/uploads/1/3/0/7/130775291/sotovakamifalifu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/ripolekaxoge.pdf
    • https://cdn.shopify.com/s/files/1/0433/7218/3703/files/fizelobuxenemibanuber.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/jitifozevikikirowifexubo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1921/4756/files/zivisidelazobidofugasagos.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/syntactic_ambiguity.pdf
    • https://cdn.shopify.com/s/files/1/0433/0510/7620/files/aircraft_parts_and_functions.pdf
    • https://cdn.shopify.com/s/files/1/0428/5127/0815/files/equifax_canada_online_credit_report.pdf
    • https://cdn.shopify.com/s/files/1/0440/8056/2326/files/spherical_roller_thrust_bearing_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1623/files/calculus_5th_edition_james_stewart_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/41299742801.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_off000062bf.bin
82bd79964836c5ff55e200a3bf0c6939ac838ec093cc21668e9b45610784fc40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62BF 5292 bytes
font_01_sfnt_off000074bf.bin
658bf867ae5bbc639a5b96bb4ce5f292a2ed8596d12e054e34c83d9f9652f8fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74BF 10096 bytes

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