Malicious PDF — malware analysis report

Static analysis result for SHA-256 67adfc821f1b02b9…

MALICIOUS

PDF

38.9 KB Created: 2020-08-31 14:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d452290484ddf50288c2d778b69871b SHA-1: 36995fc6cdb40a2bcc1b81ccd777c59592ead43c SHA-256: 67adfc821f1b02b9b85727ada94b31df06767afd1298f83ffc349113d029875b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=n+a+s+college+meerut+full+form`. It also exhibits a PDF link farm heuristic, embedding numerous external PDF links, many of which point to Shopify. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URLs and link farm structure suggest an attempt to lure users to malicious sites, potentially as part of a phishing or SEO poisoning campaign.

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.ru/pify?keyword=n+a+s+college+meerut+full+form
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5091/7269/files/97245543830.pdf
    • https://cdn.shopify.com/s/files/1/0434/1818/9980/files/69506613814.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9488/files/27851627768.pdf
    • https://cdn.shopify.com/s/files/1/0435/1016/9759/files/wagosemisowajimotin.pdf
    • https://cdn.shopify.com/s/files/1/0431/3363/2678/files/kusajuxosilusuwolojis.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6daeec956dc4b1891dab3b63d0089a3.pdf
    • https://static.usrfiles.com/ugd/b4609a_adf6daffa7a94c58abdc3f53bf82038d.pdf
    • https://cdn.shopify.com/s/files/1/0433/4721/4486/files/biological_control_of_plant_diseases_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/2589/9426/files/2645916907.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8eb50b5edf940619aa5d802bfec2b70.pdf
    • https://static.usrfiles.com/ugd/b8c837_07092c5bf4964275878e32ceb00ada4a.pdf
    • https://static.usrfiles.com/ugd/fb83f1_5530135844734a3c99f6b296f530fe4f.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_off00005a08.bin
38d31b40a1190e28de0f7050157bd3dbc782c44954bb35dc9e7d4f20d1767adb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A08 5172 bytes
font_01_sfnt_off00006b8c.bin
959b249d633831c3158763c3f7e7671cb21065376aac1259a521755447b58e76
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8C 10456 bytes