Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b3fa3cf9a8597b…

MALICIOUS

PDF

41.4 KB Created: 2020-09-18 19:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1be6a061d292bed4c3c3593973e4150e SHA-1: eda7b159bb78ce53838ae98ba12f1c43bc21f7ec SHA-256: 38b3fa3cf9a8597bc0eab2d68f6e224a01cad18231c50cfaa9ce024215874001
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One critical heuristic identified links to known malicious redirector infrastructure, specifically pointing to 'ttraff.club'. Another critical heuristic noted a large PDF link farm, with the first URL pointing to a Shopify domain. The presence of numerous links, including one to a known malicious redirector, strongly suggests a phishing or malware distribution attempt.

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.club/wix?keyword=kanonenjagdpanzer+105+equipment
    • https://cdn.shopify.com/s/files/1/0432/0378/8959/files/windows_7_activator_free_utorrent.pdf
    • https://cdn.shopify.com/s/files/1/0438/3267/2413/files/voltage_divider_circuit.pdf
    • https://cdn.shopify.com/s/files/1/0433/5845/3918/files/fujefexud.pdf
    • https://cdn.shopify.com/s/files/1/0437/0015/8629/files/34074940385.pdf
    • https://8445b7ba-4acc-46b6-b9e7-dd6ee392db48.filesusr.com/ugd/3e9e83_ba60effa30bf4e1cb755607297737d4e.pdf?index=true
    • https://31fe07e8-e22b-46eb-8f3a-fa69c120fd0f.filesusr.com/ugd/6f7357_c2d1c022ba6b48718275051f50331000.pdf?index=true
    • https://2a669921-022b-47dd-b172-1a826d3f8d3c.filesusr.com/ugd/b91566_bae7678e7e3c4b21b509688479a8839e.pdf?index=true
    • https://128e02d1-07f2-49e7-ad28-a76ecf815aeb.filesusr.com/ugd/bf57b5_b1f14d6b25f7480e83961adb3fcf05b9.pdf?index=true
    • https://1f572307-26ed-4a78-be41-faae2d4a7678.filesusr.com/ugd/0511f5_99daef9bc223477f81ff2bb4fa062a5b.pdf?index=true
    • https://3162f27e-ad2d-4b0c-b9e5-59a1ef9e601a.filesusr.com/ugd/1e557c_ebd80b25bf6f4816bd4058fe5e28d8be.pdf?index=true
    • https://bf51aea6-1c27-4491-ad52-9ba40eddadfe.filesusr.com/ugd/911c12_880714385bbc48b8b3eabe67a164cfdb.pdf?index=true
    • https://817b6bf1-cd27-496e-badf-f382846f59e8.filesusr.com/ugd/1a1092_e5f389c8f55f4bf9811d67829665bc4e.pdf?index=true
    • https://8695d607-5e05-4e6c-abbc-535fb0d93a20.filesusr.com/ugd/e78b77_9f7b0864a023422b9aa7461abafc7288.pdf?index=true
    • https://47c2cab1-c767-4e56-b0c1-52386674475e.filesusr.com/ugd/d4da64_31742d6c683943e2988738bc7dfff107.pdf?index=true
    • https://2058f0f8-3c7b-48c1-81c8-eab417cf6d7c.filesusr.com/ugd/d2057d_09b28be004794acb8efb260428fe8692.pdf?index=true
    • 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_off0000624a.bin
3e6fcbf375068a94c89c7f13107587f7f36ee6a021933b7aa0592aeac10a4827		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624A 5608 bytes
font_01_sfnt_off0000756c.bin
b13128313586b9e34bf753825b66862ccfe9a2520ae0cd5b0c5ab729898d9f88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756C 10404 bytes

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