Malicious PDF — malware analysis report

Static analysis result for SHA-256 431a17b3c1cc4862…

MALICIOUS

PDF

41.6 KB Created: 2020-08-01 06:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3440244a2e523fae328f70a21d815a8c SHA-1: 67794f310f2cedad0ea3bf126392d5a9ef7c9cb1 SHA-256: 431a17b3c1cc48624e69d8b7c3d69896e6bd25e329be545506bf19c9e165c4b6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL pointing to a redirector, which is likely the primary mechanism for delivering a malicious payload or engaging in SEO manipulation. The presence of numerous Shopify-hosted PDF links suggests an attempt to distribute malicious content through a seemingly legitimate platform.

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=recursive+binary+search+c%252B%252B
    • http://files.mybooksucks.com/uploads/1/3/1/4/131438641/vakovilekimusikaxen.pdf
    • http://files.oace.co/uploads/1/3/1/3/131381781/parotakime.pdf
    • http://files.countryside-puppies.com/uploads/1/3/1/8/131871871/bacb91b6.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/dapedajutapis.pdf
    • https://cdn.shopify.com/s/files/1/0436/4405/9806/files/64324022692.pdf
    • https://cdn.shopify.com/s/files/1/0433/8214/5182/files/63693203277.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/51261694451.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/23844574157.pdf
    • https://cdn.shopify.com/s/files/1/0432/0120/0288/files/fonoxuravirenu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7535/files/ratijunuw.pdf
    • https://cdn.shopify.com/s/files/1/0435/7138/0383/files/80126927563.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinavupomun.pdf
    • https://cdn.shopify.com/s/files/1/0431/2501/4684/files/gukasiwozu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7099/files/nojigazalabusesutujabo.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_off00005a53.bin
f465828e145236b88598e049b3cbfb9152079599d09ed1b6166cc86ecac1f569
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A53 5164 bytes
font_01_sfnt_off00006bef.bin
7b39d235bb100cdb0536a583f35353fbd4221a1fb32e1e42360fb7c80ae591bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEF 14336 bytes