Malicious PDF — malware analysis report

Static analysis result for SHA-256 9331a3f4633c2954…

MALICIOUS

PDF

38.4 KB Created: 2020-08-21 16:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37b2065c82fcaaf111abd84e4398e243 SHA-1: a1d9572593bdb08fef51cf3b5c4a5030b2d099e2 SHA-256: 9331a3f4633c295475e62842f45f9fe8b65c5d183b6ca1d34fbceb06a24595a2
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify-hosted PDF files, indicating a link farm or content distribution network. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious payload delivery mechanism. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL.

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=carson+crying+template
    • http://files.loneoak372afm.com/uploads/1/3/1/4/131482887/tamin.pdf
    • https://cdn.shopify.com/s/files/1/0433/4161/1159/files/josuvupi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3630/9666/files/aiag_cqi_14.pdf
    • https://cdn.shopify.com/s/files/1/0427/7554/3964/files/picture_comprehension_worksheets_for_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/zamuvavujejofomod.pdf
    • https://cdn.shopify.com/s/files/1/0439/1495/2859/files/49932387327.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/98189628347.pdf
    • https://cdn.shopify.com/s/files/1/0437/2781/4810/files/california_dreamin_sheet_music_piano.pdf
    • https://cdn.shopify.com/s/files/1/0450/3319/3622/files/beyonce_formation_costume.pdf
    • https://cdn.shopify.com/s/files/1/0430/0272/4506/files/fosutumikotizekavo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5788/0996/files/data_mining_algorithms_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/4818/9595/files/73537329388.pdf
    • https://cdn.shopify.com/s/files/1/0432/8603/6635/files/43733518337.pdf
    • https://cdn.shopify.com/s/files/1/0436/7309/2246/files/30627522690.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_off00004db9.bin
0f554656e7f097926c293e48a0bd6ca7f84259e1a8e0b3b9b389f8ef4f6926fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB9 5260 bytes
font_01_sfnt_off00005f83.bin
51ba63bd51bb39a37d037d1e7d76240c59921393468d3066bd3b7b4b9f6065da
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F83 2060 bytes
font_02_sfnt_off0000691c.bin
625736837cb86313e979faa69ea0adc67ef294cc756a93f1dfde7e5d80a01435
pdf-font-stream PDF embedded font (sfnt) at offset 0x691C 10288 bytes