Malicious PDF — malware analysis report

Static analysis result for SHA-256 5983173a9135b155…

MALICIOUS

PDF

44.3 KB Created: 2020-08-27 22:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dbcdd02fceb988fc06266ae062d6e6a SHA-1: 1ea93a452f85e09510de0c38fd42fa4b21b8c842 SHA-256: 5983173a9135b15512a9d3fd8caab7583a21af1179a0562ac835dd9e2598e47c
152 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, a technique often used to create link farms for SEO manipulation or to distribute malicious content. One of the primary links, 'https://ttraff.com/pify?keyword=zapatos+de+gancho+para+bebe', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also includes the same redirector URL and several Shopify URLs, some of which are confirmed benign while others are unknown.

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.com/pify?keyword=zapatos+de+gancho+para+bebe
    • http://getek.paredeslawoffice.com/uploads/1/3/2/6/132682646/kewogugilamawip.pdf
    • https://cdn.shopify.com/s/files/1/0432/8521/7436/files/definition_of_student_motivation.pdf
    • https://cdn.shopify.com/s/files/1/0436/2797/0718/files/7158120232.pdf
    • https://cdn.shopify.com/s/files/1/0430/4135/7973/files/25694512941.pdf
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/lunchroom_fight_evidence_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/monizanakuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8894/files/bomb_squad_unlimited_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0440/6919/1832/files/apologize_piano_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/1307/9203/files/4308872240.pdf
    • https://cdn.shopify.com/s/files/1/0430/4276/7001/files/xesabatog.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f8a.bin
8b1f6d515d860e738074785a4da20c25755181f539f77a9aee87a2219f0e9d52
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8A 5140 bytes
font_01_sfnt_off000070ed.bin
a82412a99f85e458870d0778edc51b5142b52aa7130de3f416a4e8770130ef92
pdf-font-stream PDF embedded font (sfnt) at offset 0x70ED 11148 bytes
font_02_sfnt_off0000954a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x954A 4324 bytes