Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f0ff942371cfbc…

MALICIOUS

PDF

38.2 KB Created: 2020-08-18 21:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fa31f14abc5836290a6d88e0a293b1c SHA-1: 62d8f0f6aadfb3dc3420827a9f8898afc8f90e8b SHA-256: 34f0ff942371cfbce57bf4e84e4719c4b79c83cd3c80323cd7a458fbfe023bd9
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with one pointing to a known malicious redirector (ttraff.com). The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact user-facing lure.

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=code+ansi+protection+electrique+pdf
    • http://files.wewandertogether.com/uploads/1/3/2/6/132681863/nuberuxiwesitil.pdf
    • http://guvede.wireart4u.net/uploads/1/3/0/8/130814328/4128589.pdf
    • http://walan.birchsage.com/uploads/1/3/1/4/131408027/xafiseji_buvujuluxasuna_watipowawi.pdf
    • http://pinuwu.tibblekigers.se/uploads/1/3/1/1/131164250/1520512.pdf
    • http://files.davidsoneats.com/uploads/1/3/1/6/131606878/8672466982be228.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6690/files/gitilasipevejab.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/nogerabibepebepigez.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5976/files/navejo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9139/2664/files/rarakowirenaruvow.pdf
    • https://cdn.shopify.com/s/files/1/0436/7374/7609/files/3723540782.pdf
    • https://cdn.shopify.com/s/files/1/0434/5790/4792/files/cisco_ise_1._3_patch.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1622/files/better_man_lyrics_pearl_jam_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0437/8414/3010/files/appsc_group_1_prelims_draft_syllabus_2020.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_off00005948.bin
eda998f9994554b55ce34ed8efba7076676307e3f05daaa2a9c26771aff71429
pdf-font-stream PDF embedded font (sfnt) at offset 0x5948 5180 bytes
font_01_sfnt_off00006af2.bin
04f650cae1c74147386a86480954462390705db2341af5b12df760de560f1146
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF2 9736 bytes