Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98cdf1d050ce2a7…

MALICIOUS

PDF

131.9 KB Created: 2020-08-11 16:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4c23cd4c7da667a6e66bb66629ca4db SHA-1: 3c180076597ca9294b0a0c54ef24a7edaa1a5893 SHA-256: c98cdf1d050ce2a751188725a754236f72e8d83d274be989f2a545d54415388c
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL 'https://ttraff.cc/pify?keyword=bible+history+pdf' is presented as a benign document but is part of a link farm designed to attract clicks. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of the payload.

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.cc/pify?keyword=bible+history+pdf
    • http://files.worldhistorywithmrjohnson.com/uploads/1/3/0/9/130969494/nosotowuleb.pdf
    • http://files.groveparkstudents.com/uploads/1/3/2/6/132683334/3ad46a683fe.pdf
    • http://files.tonypalermolifecoach.com/uploads/1/3/1/4/131437740/eaf0f757.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/59654297510.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0573/files/john_b_watson_behaviorism.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/xefedovobowuragomaxupa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3917/files/95084465778.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/intermediate_algebra_bittinger_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1220/files/34783232604.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7112/files/luxuragubojipidoposo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8921/5129/files/laboratory_apparatus_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/5915/7921/files/some_applications_of_trigonometry_class_10_ncert_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0432/2289/2711/files/85119802970.pdf
    • https://cdn.shopify.com/s/files/1/0432/0198/6723/files/wolawokabufawogu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4334/6839/files/rilip.pdf
    • https://cdn.shopify.com/s/files/1/0433/8958/3514/files/97864924436.pdf
    • https://cdn.shopify.com/s/files/1/0448/0250/6909/files/assistant_production_manager_resume.pdf
    • https://cdn.shopify.com/s/files/1/0434/1363/5226/files/health_occupations_aptitude_examination.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_off0001adc0.bin
3d29208ff0ef0683d893369b46368425049bea7870a96672e3bd47132ca4eaf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADC0 5208 bytes
font_01_sfnt_off0001bf69.bin
957266025204861d69821c16599e2e1edda4fb195e3027a920d5e8033be2f90d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF69 23888 bytes

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