Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19001e5dd8896f0…

MALICIOUS

PDF

33.9 KB Created: 2020-08-17 10:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36a3d9fddc1aeab3e9a2cabf435a2100 SHA-1: 5c4c868a3efd28a27c31b08ca786483b76ce1274 SHA-256: b19001e5dd8896f00e48bf7f7c02b4d444a5d6f74a4700d74f242090125423d5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. The document body and embedded links suggest a lure related to '1984 study guide', likely intended to trick users into clicking the malicious URL. The ML classifier strongly supports the malicious verdict.

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=1984+study+guide+part+3
    • http://files.peterregelous.com/uploads/1/3/0/7/130776757/d46c42f418ba.pdf
    • http://files.cedarkeyoutfitters.com/uploads/1/3/2/7/132712116/muduxolivulamo-beneselakizote.pdf
    • http://files.unitedworkerscongress.org/uploads/1/3/1/6/131606257/wugexob-gisofodazura.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1089/files/60974081167.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2623/files/kijupa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2399/files/21190309969.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/23061482645.pdf
    • https://cdn.shopify.com/s/files/1/0430/9689/9733/files/bacillus_cereus_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/78863291147.pdf
    • https://cdn.shopify.com/s/files/1/0428/0709/9558/files/64082740501.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2294/files/bollywood_new_full_movie_free_mp4.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_off000046a8.bin
141ca44c23c18259ea36a6a1e9eb0a7bb65a5607e7dbd9b59ecf51455a5121a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46A8 5756 bytes
font_01_sfnt_off00005a51.bin
95366824d50d4e651d365aeb9fb3f986e7e478693f351233d0674c384d7679aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A51 9736 bytes

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