Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ae4c798c934676…

MALICIOUS

PDF

37.8 KB Created: 2020-08-28 04:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf58e4bdd55b2c1a8c57afc068447789 SHA-1: 7fa9c59167a40b6ad931aa6eda886d5962f9f771 SHA-256: f4ae4c798c9346765a45c4288e55844a629fcf30e68397483d7118c572de87ec
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests the document is part of an SEO poisoning or phishing campaign designed to drive traffic to malicious infrastructure. No scripts were extracted, and the document body was heavily obfuscated.

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=e%2525C4%25259Fitim+psikolojisi+kpss+%2525C3%2525A7%2525C4%2525B1km%2525C4%2525B1%2525C5%25259F+sorular
    • http://files.colleenshaunawaters.com/uploads/1/3/1/1/131163684/eb9bd4b4.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5887/files/46924558804.pdf
    • https://cdn.shopify.com/s/files/1/0433/4921/3349/files/cidco_lottery_2020_september_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/1750/0834/files/mcps_school_calendar_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/sofemesusakowabip.pdf
    • https://cdn.shopify.com/s/files/1/0435/6587/5359/files/41103302027.pdf
    • https://cdn.shopify.com/s/files/1/0434/8549/5453/files/waponuzete.pdf
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/viwifufetewesutawagobef.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/dorejarelipugagitonowi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2705/4237/files/the_intentional_fallacy_essay.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/liczba_mnoga_angielski_dla_dzieci.pdf
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/91150474459.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/tunavawifalaxojifunudi.pdf
    • https://cdn.shopify.com/s/files/1/0457/8190/9660/files/93547260439.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/17581594562.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_off0000503f.bin
74a168f93143fed5dcff79eaafb7afd47648b8af91a221e651f89a32a64e3c37
pdf-font-stream PDF embedded font (sfnt) at offset 0x503F 5756 bytes
font_01_sfnt_off00006326.bin
54d4b9a5e50e0e6140054871925059da1e907d159f71b7e20821650ebc6743e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6326 11772 bytes