Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b31d9dafc8f4c57…

MALICIOUS

PDF

51.3 KB Created: 2020-09-19 19:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc242b217d6d4ae1dc37eee6f7767b1e SHA-1: 8c8594808470fa6b6cd3d7b9ca15912f7059fa08 SHA-256: 4b31d9dafc8f4c57e8141a3af9cd0a93d2bf4f3458b9b95e177607ce0fbbd5a9
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified links to known malicious redirector infrastructure, specifically `https://ttraff.club/wix?keyword=empire+total+war+poland+guide`. Another heuristic indicated a link farm, with 24 external PDF links, suggesting an attempt to distribute malicious content or engage in SEO abuse. The document body contains garbled text but also includes the same suspicious URL, reinforcing the malicious intent.

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=empire+total+war+poland+guide
    • http://potubako.krislibrary.com/uploads/1/3/1/0/131070357/kijanuxetena.pdf
    • http://files.jacobs-ladder.co/uploads/1/3/1/4/131407067/voponidebetom-jomewax-patoru.pdf
    • http://wogapavi.hcreled.com/uploads/1/3/1/3/131384082/5640270.pdf
    • http://pazum.trangallan.com/uploads/1/3/1/6/131606339/ffdb97a63608.pdf
    • https://d1abf650-ac7e-49cc-b8ea-9dd1ec465251.filesusr.com/ugd/9904c2_6f3b6ddc77204553bbe6c01397374c1d.pdf?index=true
    • https://993a1669-ba66-4ddb-8d79-123fe516311c.filesusr.com/ugd/0286dd_6024a000401240d1b298d04edc56b9f5.pdf?index=true
    • https://0f1a5026-2406-4248-b6ad-cc8858ce5615.filesusr.com/ugd/436160_1f06192373fa406da28739c26f16b57e.pdf?index=true
    • https://f4c18cff-e2f6-4e0c-b355-935f71c39e9c.filesusr.com/ugd/e23fbb_e6241939f0d14c41b7fa3022c59ef4e5.pdf?index=true
    • https://b784d7a6-e826-4c33-b91a-a044e7db8935.filesusr.com/ugd/3ed902_c7e922644f8e4796a4009e1bcf1875fe.pdf?index=true
    • https://a1ec3a05-f484-4260-9328-689d27b036ae.filesusr.com/ugd/fd7405_c02b52ebf07d494e9e84cefcb139973f.pdf?index=true
    • https://58e38e6d-a848-4edb-9228-2e2653bbc892.filesusr.com/ugd/0c8cc8_3b446ee5d6094cf3adcb5f00148a8d93.pdf?index=true
    • https://db55375b-2f64-4a0c-a611-b6bb136b446c.filesusr.com/ugd/efc97f_cd8531f8ecc447e2be975c3572456ae4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007577.bin
f97970ba9386fb12b46206bb031d8c457b558a8c24ac16c2cdab7ff7fdc4ba51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7577 5152 bytes
font_01_sfnt_off000086fa.bin
db64e23aa3ad06d6414747a6915ee6d790b12042dcfb0a5a5ab25e4c563bdfea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86FA 10340 bytes
font_02_sfnt_off0000aa92.bin
ba11a93f5048ae8472b7177df685806fd18b8cc29be6b0d4f33ce6e98c2a9d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA92 16416 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.