Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31dc8e2ae8a1b12…

MALICIOUS

PDF

41.0 KB Created: 2020-08-23 06:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 287bd2b5b1077e3e9d837b5929f1f9e3 SHA-1: ad7d57a2efa9d85b9cd11c984aa0aee8ff992a39 SHA-256: d31dc8e2ae8a1b1227759006408176106d110a7f9e4a58ec07339cb968375c77
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding numerous external links. One prominent link directs to a redirector service, 'ttraff.com', which is flagged as malicious. This suggests an attempt to obscure the ultimate destination of the malicious payload. The presence of many Shopify-hosted PDF links, while some are benign, is part of the overall link farm strategy. No scripts were extracted, and the document body is heavily obfuscated, but the heuristic firings strongly indicate a malicious redirection scheme.

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=bevorzugten+netzwerktyp+festlegen+android
    • http://muwubiliw.countertopalternatives.com/uploads/1/3/2/8/132814964/d9408f4bc0fc1.pdf
    • http://files.lucillescatering.com/uploads/1/3/2/6/132695629/2fcae8a787eda95.pdf
    • http://files.diversejewellers.com/uploads/1/3/1/8/131856531/gizomibaxerujag.pdf
    • http://files.robertthorntononline.com/uploads/1/3/0/8/130874265/pabus_norasa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/8953537872.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/pumeripuwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/black_s_law_dictionary_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/5879/8492/files/59175821369.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/sinezisevagetigajifuwu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6904/files/bollywood_movies_website_list_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0436/9216/3227/files/invitation_to_tender_email_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/3656/3866/files/fl_studio_12_tutorial_beginner.pdf
    • https://cdn.shopify.com/s/files/1/0434/0377/2056/files/71538152559.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_off00005ec2.bin
fb523320d7178e6f512396ae7cca77a14f0edeb912aafd6084be489374a97ac9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC2 5624 bytes
font_01_sfnt_off0000722f.bin
3510876fc0f69df80323fa65cb6e9ce4a2b4ac2f5e80b57353b57386f08ce8e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x722F 11360 bytes