Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc08ea06106e7da…

MALICIOUS

PDF

40.0 KB Created: 2020-08-10 16:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 239d744c8c0dfdab275a9ca4c64466de SHA-1: 6703375999c15774ded2e03dd1585641928cdcc7 SHA-256: 3bc08ea06106e7da9c75e4d24d9b352ada4d69a6c7e44853854e550bc19a90c0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious domain, likely as part of a phishing or scam campaign. The document body text and embedded URLs suggest a lure related to checking document fonts. The ML classifier strongly indicates maliciousness, and the PDF structure includes a mass external link farm, further supporting a malicious intent.

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=check+font+in+pdf+document
    • http://bolite.marsellascience.com/uploads/1/3/1/6/131636612/ecfb3a257.pdf
    • http://files.raphswall.com/uploads/1/3/1/4/131437330/witupib.pdf
    • http://files.maltascalemodelshop.com/uploads/1/3/0/8/130874161/fasuliwivon_vasibipeju_tajavoriv.pdf
    • http://files.truewealthfg.com/uploads/1/3/2/7/132710687/migejowo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1942/6198/files/jikowevazawajagapirital.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/61325434612.pdf
    • https://cdn.shopify.com/s/files/1/0433/3980/8922/files/78732109196.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0551/files/33789992931.pdf
    • https://cdn.shopify.com/s/files/1/0428/6893/2767/files/que_es_el_lenguaje_corporal.pdf
    • https://cdn.shopify.com/s/files/1/0437/4183/9514/files/46796224846.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/42279836266.pdf
    • https://cdn.shopify.com/s/files/1/0436/4750/0448/files/nituludunudusosege.pdf
    • https://cdn.shopify.com/s/files/1/0432/5467/7662/files/pexixazuxizoxotaganuxofe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/55056579981.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_off00005f7c.bin
d3428596b0b736483a734741d34b2d1f211587449f81fb32ebaaa24da54959dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7C 4848 bytes
font_01_sfnt_off00006fce.bin
e9631bed8a2e88c8adebb3d613468d431e18f30315cfd40edf0fa75531b50efe
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCE 10240 bytes