Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f5849d76ef3526…

MALICIOUS

PDF

51.5 KB Created: 2020-07-23 23:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9c4174bdfad67fcf8afa2d6a86ea4cd SHA-1: 2bf44493026352d79e3f81a99fafa4ee9d77e730 SHA-256: 44f5849d76ef3526c446a10f1d7d5dd969b84be56bec3352d02a8bdd62f07198
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'Apple cash flow statement pdf', suggesting a phishing or scam lure. The presence of numerous embedded URLs, many hosted on Shopify, further supports the link farm and redirection attack pattern.

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=apple+cash+flow+statement+pdf
    • http://files.kristinebournemsrn.com/uploads/1/3/0/9/130969148/4468759.pdf
    • http://files.nhldraft.net/uploads/1/3/0/8/130814706/45fabdaee02.pdf
    • http://files.prideontheplains.com/uploads/1/3/1/4/131453451/8054ae0.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/penanovasilesonagasin.pdf
    • https://cdn.shopify.com/s/files/1/0433/5940/4197/files/vofojusikezerujukejob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vaxopegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
    • https://cdn.shopify.com/s/files/1/0428/6119/9526/files/17461441907.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5274/files/sogaraguzabuvim.pdf
    • https://cdn.shopify.com/s/files/1/0437/8748/5342/files/narepok.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/zogizir.pdf
    • https://cdn.shopify.com/s/files/1/0438/4037/2896/files/97278888337.pdf
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/90595048818.pdf
    • https://cdn.shopify.com/s/files/1/0429/6710/5687/files/sukinikuli.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/58796461388.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9236/files/sorefexilanum.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_off00008304.bin
47d8479d6cc2d3efe4961f520a9f0a46ccc15cebfc9cb7b21a955c4979b244f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8304 5120 bytes
font_01_sfnt_off00009459.bin
a1a8b91ebb4755d55362c0dce3558eba16373ede7a4b973a336a4e3c85bfa9a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9459 13672 bytes