Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd70fd6e8ff714bd…

MALICIOUS

PDF

41.6 KB Created: 2020-08-06 23:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fff2bc5889c5e0974d7546d1851cef2 SHA-1: e15d40b008f899a696dd5cb650a49ce6021e6c77 SHA-256: bd70fd6e8ff714bda8276b3a312dcc9ced2b00440c85042fb4a105dbf6ccee36
152 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to lure users to malicious sites. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, indicating the primary attack vector is user interaction with this link. The ML classifier strongly supports the malicious verdict.

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=asterix+and+obelix+the+golden+book+pdf
    • http://files.debaerelab.com/uploads/1/3/0/7/130739387/lilonasojokun_jodetonoj_bujetix_lonijuxonif.pdf
    • http://files.grandviewlodgeandresort.com/uploads/1/3/1/4/131437889/852133383867.pdf
    • http://salulop.northwoodsswissy.com/uploads/1/3/1/4/131453870/fbde6.pdf
    • http://files.interhashtrinidad2020.com/uploads/1/3/1/4/131453870/828613.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1376/files/grapeapplesauce_texture_pack.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/nonokot.pdf
    • https://cdn.shopify.com/s/files/1/0437/2794/5889/files/make_photoshop_free_trial_forever.pdf
    • https://cdn.shopify.com/s/files/1/0439/3995/4856/files/buffer_overflow_explained.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/16066230027.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/menine.pdf
    • https://cdn.shopify.com/s/files/1/0431/8278/4676/files/37886276676.pdf
    • https://cdn.shopify.com/s/files/1/0434/2464/5272/files/logic_gates_using_diodes_and_transistors.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4601/files/16844145812.pdf
    • https://cdn.shopify.com/s/files/1/0431/3301/0081/files/loririrasirebemenan.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_off00006500.bin
77377eb837ae702ca55217db6b4b1cf7926d5727baf0dcf3790415c041987847
pdf-font-stream PDF embedded font (sfnt) at offset 0x6500 5564 bytes
font_01_sfnt_off000077e2.bin
37444ae970b89324dadb2b70ae148e757dccde81c82874c1f1c167ed3d33cf1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x77E2 9784 bytes