Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f12421e96fbe97…

MALICIOUS

PDF

31.4 KB Created: 2020-07-31 23:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28510833bdab9bdcbcb32d653d384843 SHA-1: 7f0d83dbd14441614fd79f1ded76948ce0577285 SHA-256: e6f12421e96fbe977218b57d86dbcf880a32a8ad8eb8d5d4e47e3225b03f6448
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous URLs, with one specifically identified as a malicious redirector. The primary attack pattern appears to be the creation of a link farm to manipulate search engine results or distribute malicious content, rather than a direct exploit within the PDF itself.

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=advanced+d%2526+d+player%2527+s+handbook+pdf
    • http://files.g1muzic.com/uploads/1/3/2/3/132303351/siganemumoz_gawegusufegu.pdf
    • http://files.godshealingprocess.com/uploads/1/3/1/3/131383548/2258471.pdf
    • http://files.acubyhoma.com/uploads/1/3/0/7/130775222/sutaxes.pdf
    • https://cdn.shopify.com/s/files/1/0431/9232/0161/files/74572118520.pdf
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/89957329452.pdf
    • https://cdn.shopify.com/s/files/1/0432/3590/1602/files/58567495880.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/82272796201.pdf
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/rikalobasenabajujixa.pdf
    • https://cdn.shopify.com/s/files/1/0435/9893/8274/files/5985859197.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/seren.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuwuvedalolavotidexetugom.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6863/files/2957600104.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_off00003fe7.bin
798c4d160e2b37ec353c11534addc4be1aca170a931da83f9db31fa3527aa5a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x3FE7 4676 bytes
font_01_sfnt_off00004fea.bin
82cc12628613bc5fddb31237a57cf3ab28484d574c04ad18cd82daba85128fac
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FEA 9728 bytes