Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b22c07649da215…

MALICIOUS

PDF

33.2 KB Created: 2020-08-05 10:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36417a726ebdb5db7440172c376e784a SHA-1: e667336b6b9609d0fea233bfe4f588a48fe16752 SHA-256: c9b22c07649da215fe376b542262aedc3b57da9b0db755cbeac06e7b9b446df7
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL identified as https://ttraff.com/pify?keyword=aesculap+surgical+instruments+general+catalog+pdf. This suggests the document's purpose is to lure users to malicious infrastructure, likely for subsequent malware delivery or phishing. The ML classifier strongly supports this assessment.

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=aesculap+surgical+instruments+general+catalog+pdf
    • http://files.melissakroetsch.com/uploads/1/3/0/7/130775784/7947251.pdf
    • http://files.daytonsockcompany.com/uploads/1/3/1/1/131164236/vawano-kesupapo.pdf
    • http://files.theidealorganization.com/uploads/1/3/0/8/130874316/9308708.pdf
    • http://files.gonzagahealth.com/uploads/1/3/0/7/130775297/3d170.pdf
    • https://cdn.shopify.com/s/files/1/0438/2900/2390/files/87362576004.pdf
    • https://cdn.shopify.com/s/files/1/0429/6844/9180/files/19284425630.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefopevepal.pdf
    • https://cdn.shopify.com/s/files/1/0430/9087/0423/files/47155036653.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3658/files/97937532317.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/ruvalavatofutas.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0104/files/dapisomegovexenol.pdf
    • https://cdn.shopify.com/s/files/1/0430/8218/6905/files/49091574109.pdf
    • https://cdn.shopify.com/s/files/1/0439/2324/3176/files/faduxome.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6841/files/gojukunofotodenafawoj.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_off00004501.bin
aacf4227b35feed57271482d80cf1199ea7bf7af45e5301c0e60b9b0c96b24d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4501 5464 bytes
font_01_sfnt_off00005784.bin
a51c5e1273f82e5995f6b53e491ff73dcb78b05448f36f52cf5b45e750023b3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5784 9480 bytes