Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9cd7d719bb0aff…

MALICIOUS

PDF

41.8 KB Created: 2020-08-21 18:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39dd17384ec5832b931877c21efd2da0 SHA-1: 20fe35c4bfff77642f0f87539a81150d5bc65323 SHA-256: ad9cd7d719bb0aff7f5904394615797114d7aeb965c8e8c3bd4c2866142befc7
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding a large number of external links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL and a reference to 'Nitroglycerin davis drug guide', suggesting a lure to a potentially harmful resource.

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=nitroglycerin+davis+drug+guide
    • http://files.puregoodnessmn.com/uploads/1/3/0/7/130775361/8400446.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/mumuzapewe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0484/5465/files/rojogumade.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/iso_16949.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7110/files/makkar_ielts_speaking_jan_to_april_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/22755382252.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/bosuzogukofagi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/wijopolemexigojomepuwiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8378/3575/files/android_version_names_a_to_z.pdf
    • https://cdn.shopify.com/s/files/1/0429/3984/2719/files/class_action_research_proposal.pdf
    • https://cdn.shopify.com/s/files/1/0441/3263/0680/files/28927579168.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_off0000661a.bin
6c3cd225d05c07968b8b7817f69df03062ae8b14d478d5f329b41057a28ebc5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x661A 5236 bytes
font_01_sfnt_off00007806.bin
7eac97a9f1908c64e486d37ba2b19a6ad146a599acae2aaf480d6543fbaeab7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7806 10060 bytes