Malicious PDF — malware analysis report

Static analysis result for SHA-256 2515d9bef13c31d4…

MALICIOUS

PDF

42.1 KB Created: 2020-08-24 16:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 128124eae98c0c797c699f631465b9ec SHA-1: 8becd2e45b2d241e1715591064ea8b720e63081c SHA-256: 2515d9bef13c31d440befd673b2313fb2926a17f51f1e167e8a6ffd81db8cd15
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=reporting+limit+vs+method+detection+limit'. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a link farm or redirection scheme. 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.ru/pify?keyword=reporting+limit+vs+method+detection+limit
    • http://files.caresga.org/uploads/1/3/1/3/131379343/xaxukebutuzinup.pdf
    • https://cdn.shopify.com/s/files/1/0428/7424/1183/files/21308752762.pdf
    • https://cdn.shopify.com/s/files/1/0428/3429/6988/files/57810043059.pdf
    • https://cdn.shopify.com/s/files/1/0430/6187/0743/files/zujakozulufudakisejuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4254/files/ziredinapiwi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5669/files/dictionary_english_to_english_to_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/sixapuxinisoponexa.pdf
    • https://cdn.shopify.com/s/files/1/0435/3336/9503/files/zedim.pdf
    • https://cdn.shopify.com/s/files/1/0435/2576/7320/files/teacher_aptitude_test_questions.pdf
    • https://cdn.shopify.com/s/files/1/0465/0595/1390/files/50807379571.pdf
    • https://cdn.shopify.com/s/files/1/0450/7333/4424/files/bioplastic_from_banana_peel_research_paper.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/migirumugufif.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/91637516950.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8711/files/regixanisokifidudetos.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_off00006626.bin
ea544c16c963327569d569813d76410c7da8eeb7a23a80a11bc5872ac1830ec7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6626 5344 bytes
font_01_sfnt_off00007835.bin
5f75f137e6ad067d0012732b39521b87dfa852e1128ebba7192b0ad7fad3200c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7835 10516 bytes