Malicious PDF — malware analysis report

Static analysis result for SHA-256 4611b98d0345ff75…

MALICIOUS

PDF

57.4 KB Created: 2020-09-18 13:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ade1878b9183463c400d4fb5c2dccf1 SHA-1: 3b7681bfd47c729e81c054dfeea58c32020b67a1 SHA-256: 4611b98d0345ff75e4d3899bbff856123a69f7e858c5b6b63a378c4061681dc5
154 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 a large number of external links, indicating a link farm or redirection attempt. One of the embedded links points to a known malicious redirector. The document body contains a URL that appears to be part of the link farm. The primary attack pattern involves leveraging these links for malicious purposes, such as SEO manipulation or user redirection.

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=thai+khmer+movies
    • http://files.homewoodtrackandfield.com/uploads/1/3/0/8/130874197/2883443.pdf
    • http://fadivi.atmospherehealth.ca/uploads/1/3/2/6/132682663/fofemag_zuwim_nedolutuz.pdf
    • http://fikidazu.eldobulldogband.com/uploads/1/3/2/3/132303127/wolewakivimened.pdf
    • http://files.esskayebooks.com/uploads/1/3/1/3/131398338/pifijosogegonapeg.pdf
    • http://gatelew.steindoodles.com/uploads/1/3/2/7/132740435/9ce323a066a5.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/luwokadaxasol.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/juxomofelanobasi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0344/4380/files/grid_template_minmax.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/takopoxokezuz.pdf
    • https://f3633e49-f752-45c4-bb76-243daaf3a2b4.filesusr.com/ugd/20d83a_de4c44e22294458d9788a2924d319fdc.pdf?index=true
    • https://1627bbfb-038c-4035-abcd-95ea3ebf546c.filesusr.com/ugd/e2c223_e42ad001a80e4cc6a9f46a6f23a95189.pdf?index=true
    • https://ec6ec61b-6cbf-4dab-b1dc-0c4c909252bd.filesusr.com/ugd/2c76f4_6dd2092386f74a3aa175bdcbb479483c.pdf?index=true
    • https://36c626c4-7514-41c3-938c-76f94e56dbcc.filesusr.com/ugd/98e298_4870c5b6d1e8483884e40ae984c9e92a.pdf?index=true
    • https://7dd508b0-c21d-445a-af9e-f324f5f859a7.filesusr.com/ugd/95ea6b_8f92390233ad4a07838f3a35c35ec87c.pdf?index=true
    • https://9ecdbaa8-601d-446f-b86a-c54c238395b8.filesusr.com/ugd/d8966e_82938862ddf14b2d8351dbb0580b256b.pdf?index=true
    • https://11aa9124-8177-4a94-94c3-8411ca526a06.filesusr.com/ugd/18574e_21eefa817b274ffbbecdd4fa3986e017.pdf?index=true
    • https://993295fb-7bbd-413e-97ea-c363ff53d48a.filesusr.com/ugd/93971e_240778d07bc44ce1a0d88d02223df756.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_off000097e9.bin
03e571e910c624b220d8323dec7fa46d2448b23d53d234b5ca6c54b86509223a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E9 4964 bytes
font_01_sfnt_off0000a8a7.bin
40dea2a8ae813178a3afd3723939341066ff9b1d033ac0e74352d09ef703b9c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A7 15708 bytes

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