Malicious PDF — malware analysis report

Static analysis result for SHA-256 893877a38e2e49e6…

MALICIOUS

PDF

35.5 KB Created: 2020-07-26 18:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28c845a475d4da01212eeb4fba568162 SHA-1: 3a12afc09ef47140b9316ec7e73eaac255f877f3 SHA-256: 893877a38e2e49e666837adff71942e119d67f3931d2ceb72ba6e258f946bec4
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, creating a link farm. One prominent link, 'https://ttraff.ru/pify?keyword=sweet+baby+photos+hd+free', is identified as a malicious redirector. The ML classifier strongly indicates maliciousness, supporting the attack pattern of luring users to malicious sites.

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=sweet+baby+photos+hd+free
    • http://files.richlandsrbetaclub.org/uploads/1/3/1/4/131406434/waludewonalo.pdf
    • http://files.judithviskerart.com/uploads/1/3/0/7/130739021/b1c60ebf8a7319e.pdf
    • http://files.heavytruckphotos.com/uploads/1/3/0/7/130739353/9eaa3.pdf
    • http://files.mojosexual.com/uploads/1/3/2/6/132680932/7270646.pdf
    • http://files.amandamelissa.co/uploads/1/3/0/8/130814235/nopikinoko.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.pdf
    • https://cdn.shopify.com/s/files/1/0428/7817/3343/files/nekedukigumeja.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/pujojivap.pdf
    • https://cdn.shopify.com/s/files/1/0428/5261/4311/files/bidugazovorudinirijiri.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/88075317933.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/22362867815.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/79498631835.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5885/files/finigekezezubokeseronix.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5702/files/mafewawedurupewizoduw.pdf
    • https://cdn.shopify.com/s/files/1/0430/9241/0525/files/vuvafazabalasoxivadofi.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_off000052d2.bin
c9964993c34f35c7bfa5cb04ebe843ae3b872732f9090589aeb7d4c1dd716741
pdf-font-stream PDF embedded font (sfnt) at offset 0x52D2 5168 bytes
font_01_sfnt_off00006489.bin
379bc0b9ef27170aec50a28c2ea4277ad8d109eb9b82df0704f981b07516af55
pdf-font-stream PDF embedded font (sfnt) at offset 0x6489 8448 bytes