Malicious PDF — malware analysis report

Static analysis result for SHA-256 836d561c2592404f…

MALICIOUS

PDF

43.2 KB Created: 2020-09-06 00:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d23343a8aeab0d5e2913128a21167e2e SHA-1: 2e68cbadec3c7de8708ec64813d856523701de4d SHA-256: 836d561c2592404fb46afd234d7a154af728f925bc1bef48ebc7d6b63bd9524b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.me, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to 'Clinton county mo police reports' and numerous links to PDF files, suggesting a link farm or SEO poisoning tactic to attract victims. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=clinton+county+mo+police+reports
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3464/8474/files/border_patrol_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/9793/9349/files/sengoku_basara_pc.pdf
    • https://cdn.shopify.com/s/files/1/0434/0744/2072/files/36866774448.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f545942665f4956b9b6db7e20f508dd.pdf
    • https://static.usrfiles.com/ugd/34e21e_49f97de33b3a4f9189eb6d268a1c1a0d.pdf
    • https://static.usrfiles.com/ugd/8716ab_94072d081de74562bec5660fd6c60414.pdf
    • https://cdn.shopify.com/s/files/1/0431/6489/3345/files/arthur_rimbaud_sensation.pdf
    • https://cdn.shopify.com/s/files/1/0437/1424/8857/files/zutegirabelej.pdf
    • https://cdn.shopify.com/s/files/1/0429/9866/1279/files/lisumukanenudunosiduduzun.pdf
    • https://cdn.shopify.com/s/files/1/0429/3050/3846/files/44744765416.pdf
    • https://cdn.shopify.com/s/files/1/0431/5788/0996/files/uji_non_parametrik_mann_whitney.pdf
    • https://cdn.shopify.com/s/files/1/0447/2219/2537/files/tennessee_williams_the_glass_menagerie.pdf
    • https://cdn.shopify.com/s/files/1/0458/6438/6713/files/rizusigokano.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_off00006b51.bin
beea1601e61cc2828d996e2dc0a57e892c6ca1ef36a4333f701e74cc82838fec
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B51 4876 bytes
font_01_sfnt_off00007bd9.bin
357f4a661b115f0caddfcdd2b4adf6f9fc0e2b2578b80222c570050bdf1283ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD9 10676 bytes