Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fa71e57d08ac4c…

MALICIOUS

PDF

40.9 KB Created: 2020-08-23 11:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c25a1e10e2746fc96884883d4ba52a8a SHA-1: 4dcb38f5fa29a84fb03be51b3e165006bda95a6d SHA-256: 63fa71e57d08ac4c4c5c31aa3587d4691f75361428149757827d1f6e1d132171
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with 28 identified as SEO-related links to other PDFs, likely for link farming or distributing malicious content. One critical heuristic identified a link to a known malicious redirector at https://ttraff.com/pify. The ML classifier also strongly indicated maliciousness.

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=huun+huur+tu+ancestors+call
    • http://guzosu.jayhoss.com/uploads/1/3/1/8/131858530/34292013747.pdf
    • http://files.resilienceuckfield.co.uk/uploads/1/3/1/4/131407952/tavofunixubalu.pdf
    • http://fujupuw.grapetelevision.com/uploads/1/3/1/6/131606289/2634696b4b7ff0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6908/6619/files/aprendizaje_colaborativo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruwisosipopiwusanitilowaz.pdf
    • https://cdn.shopify.com/s/files/1/0436/7053/6345/files/38661809153.pdf
    • https://cdn.shopify.com/s/files/1/0436/0162/5252/files/ecology_short_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wurawosupamajo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/82606878930.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44368867506.pdf
    • https://cdn.shopify.com/s/files/1/0430/6747/4087/files/13132421797.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/54490378631.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/timerurozefulupuvisijo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9943/7721/files/67725455539.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062e6.bin
649f2375a00143da6d5301da3196501785abf5765d123db975bd90d86cd4a243
pdf-font-stream PDF embedded font (sfnt) at offset 0x62E6 4848 bytes
font_01_sfnt_off00007343.bin
c04fa82c45e3605a959f3df3c734efa8c72815cece02a20e50017fc2a4be9b21
pdf-font-stream PDF embedded font (sfnt) at offset 0x7343 10596 bytes