Malicious PDF — malware analysis report

Static analysis result for SHA-256 8967735cd2df3662…

MALICIOUS

PDF

42.5 KB Created: 2020-09-05 21:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32343510a8236e6e24c72fc1069bad56 SHA-1: 6e9b55cffbb925e030d2c918f0f1f36d0b4ac802 SHA-256: 8967735cd2df3662fe91eb6577882e73699205025c889fcd5575fce5c367d044
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.link, which is designed to lead users to malicious content. The document body and embedded URLs suggest a lure related to educational worksheets, likely a social engineering tactic to encourage clicks. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be the malicious link.

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.link/wix?keyword=inference+comprehension+worksheets+year+4
    • https://cdn.shopify.com/s/files/1/0434/6878/3773/files/free_translation_french_to_english_file.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/bijigaketajaxokewif.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6032/files/gajag.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdf
    • https://cdn.shopify.com/s/files/1/0441/0834/9592/files/tasawela.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/84455339788.pdf
    • https://static.usrfiles.com/ugd/93c935_12d6c9270d6b4b048510b2dc9aa9b220.pdf
    • https://static.usrfiles.com/ugd/c0a468_017b6a8f187648f9b7f5e8b33676de56.pdf
    • https://cdn.shopify.com/s/files/1/0446/3493/1363/files/ssc_biology_notes_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0437/2499/6773/files/52484290139.pdf
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/vaxaxezalujedukaruwusak.pdf
    • https://cdn.shopify.com/s/files/1/0440/6129/4757/files/17723332456.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_off00005a74.bin
94395a9b6e0c46a5c19dd27299495a1fca9194b03b53e4f6d0cdc6615ef9395c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A74 5296 bytes
font_01_sfnt_off00006c54.bin
8d52b38c93b0464d6dafc0c39b51790f548d6485096ef2ae121b9ba4ee65d066
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C54 10164 bytes
font_02_sfnt_off00008f14.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F14 4324 bytes