Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3310c2837d425c…

MALICIOUS

PDF

44.8 KB Created: 2020-08-02 06:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8aa2c9ff342a93974b3942be0719f0cb SHA-1: 2461b0ba4b70c28bde28c30f6ee57b02b0bb7174 SHA-256: 6a3310c2837d425cd9c8bad7106e50462e35841e021a6f1185846101b0e87bf1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The document also features a large number of external links, many pointing to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic to increase visibility. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector 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=briggs+and+straton+boat+motor
    • http://files.srhair619.com/uploads/1/3/1/1/131164157/e5227ce4.pdf
    • http://files.ecrcme.com/uploads/1/3/1/3/131380889/95b954b848c1ad.pdf
    • http://files.zionhillbrookshire.org/uploads/1/3/1/0/131069863/4bc942856a33f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6408/2073/files/33845826884.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/finite_mathematics_and_calculus_with_applications.pdf
    • https://cdn.shopify.com/s/files/1/0438/6763/5867/files/19252884553.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nulexukiwogefera.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9685/files/docker_pdf_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/xutijimimutozevoma.pdf
    • https://cdn.shopify.com/s/files/1/0433/2932/3158/files/desus.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/sun_vat_40_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/2175/3758/files/xixesukagixawufitet.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7473/files/68127048250.pdf
    • https://cdn.shopify.com/s/files/1/0427/9776/0668/files/43817405714.pdf
    • https://cdn.shopify.com/s/files/1/0437/1028/3931/files/fogorore.pdf
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/jozitusabewibo.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f6b.bin
ddfe00eb4566376d2e38db24bf7075383fe10842f0dcf03a91408bbbed372957
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6B 5300 bytes
font_01_sfnt_off0000815a.bin
50361c9f48b508d87109cdb8d404095447b1b03215b5129be7637f6ae49625aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x815A 10364 bytes