Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbcfb85e6e48962…

MALICIOUS

PDF

101.2 KB Created: 2020-08-19 19:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed09ef689979eaaf2072a9299953f99e SHA-1: ef68a011a61aed05b8f9a7d023346f05b3111e42 SHA-256: 4cbcfb85e6e48962ba271fbde4ffc469306fe341bae4456f3b6c947615867605
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL as the malicious link, suggesting it's the primary lure. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm strategy to improve search engine visibility for malicious content. No scripts were extracted, and the PDF structure itself is the vector for the attack.

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=assembler+directives+of+8085+microprocessor+pdf
    • http://vofimevip.goldcoastpaediatrics.com/uploads/1/3/0/8/130873995/fa3e58550.pdf
    • http://zutixilew.maggiegyoga.com/uploads/1/3/0/7/130775918/xoligisewiduginimad.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3794/files/27371088493.pdf
    • https://cdn.shopify.com/s/files/1/0433/9095/9766/files/beyonce_i_am_sasha_fierce_zip.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4201/files/architecture_meaning_and_place_selected_essays.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/49132404126.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/peratexedabapirox.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/91996345607.pdf
    • https://cdn.shopify.com/s/files/1/0430/9870/1977/files/45777398496.pdf
    • https://cdn.shopify.com/s/files/1/0430/9542/5191/files/18295359749.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/afcat_2_2020_question_paper_with_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/9339/3557/files/47868087272.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4201/files/57327311357.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_off0001434b.bin
2547c4c2fb8ac5a12dece805d5a61294a58913af3f9b0ef5d422b553f4aaf406
pdf-font-stream PDF embedded font (sfnt) at offset 0x1434B 5740 bytes
font_01_sfnt_off000156c2.bin
a974487d1ce2e7fb284a2d4329a0ed88cf9487392ae1003446e8b8400f388a95
pdf-font-stream PDF embedded font (sfnt) at offset 0x156C2 15384 bytes