Malicious PDF — malware analysis report

Static analysis result for SHA-256 d534c5b381c4df1d…

MALICIOUS

PDF

45.8 KB Created: 2020-08-05 14:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa4587d631f241b4792baa7395fd7d7e SHA-1: 07aa30dde0e0db2f941254b96b199e5477ea26eb SHA-256: d534c5b381c4df1d1eb13837530135923d7e2eeaae7f235a20cc8a08e7608346
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a large number of embedded links, identified as a link farm, with the primary redirector URL being ttraff.ru. The document body, though heavily obfuscated, contains the same URL, suggesting it's the intended destination. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links points towards a phishing or malware distribution attempt.

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=les+faux+amis+francais+anglais+pdf
    • http://files.artemisandarts.com/uploads/1/3/1/0/131071157/1228211.pdf
    • http://letos.leilasabet.com/uploads/1/3/2/3/132303382/zoxabaw.pdf
    • http://nunuwew.samahanfilamheritage.org/uploads/1/3/1/4/131407089/newexibot-tazoroza.pdf
    • https://cdn.shopify.com/s/files/1/0432/7764/8027/files/pasar_archivo_a_word_online_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0436/9678/3514/files/tezovukenisor.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7733/files/kixesatutulijavelegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7596/0985/files/xuwisi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5788/0996/files/dynamic_bones_unity.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/guzajezesu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/21703986756.pdf
    • https://cdn.shopify.com/s/files/1/0438/3001/8210/files/59636328863.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/35483123187.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/93588796672.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lekerumukin.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_off00006574.bin
d5403eb6d1125790cd3fbd4bdfbf1a2656c5b0995a977c34fbd2f1606e240f04
pdf-font-stream PDF embedded font (sfnt) at offset 0x6574 5484 bytes
font_01_sfnt_off0000780f.bin
d8d375708368e78745d5d04239f0976a9ed22fb6e788f71f5b0da876f95687f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x780F 16284 bytes