Malicious PDF — malware analysis report

Static analysis result for SHA-256 75162012c0bde0cd…

MALICIOUS

PDF

55.9 KB Created: 2020-08-15 06:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7e0139f783f512598974b255040c2d0 SHA-1: 6c50730606f4ecbd1bf7c1739af29fa91183f5da SHA-256: 75162012c0bde0cd1713a8cbccae86ba65f319d2d375b45f386a328366f6c40e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to manipulate search engine results, with many pointing to benign Shopify domains but ultimately leading to the malicious redirector. The primary attack pattern involves luring users to malicious sites via these links.

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.com/pify?keyword=speech+audiometry+book+pdf
    • http://files.sweetbasilhurst.com/uploads/1/3/0/7/130776131/ligodomiraforut_xudijuf.pdf
    • http://files.wellanddenturecentre.com/uploads/1/3/1/4/131453284/2aac18c6706.pdf
    • http://nasuge.latreiawoodblinds.com/uploads/1/3/2/6/132681352/rolapi_podugibogu_fanaxoweda.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6000/files/support_vector_machine_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3140/files/patanurekajejizusuleju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/accounting_standards_list_with_explanation.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/56449571764.pdf
    • https://cdn.shopify.com/s/files/1/0432/0785/2192/files/zelejegap.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8864/files/escribir_caracteres_chinos.pdf
    • https://cdn.shopify.com/s/files/1/0428/5458/0390/files/algebra_2_homework_practice_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5799/files/vigonosomuginajitivixup.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/xanozumopobevabe.pdf
    • https://cdn.shopify.com/s/files/1/0436/5680/6553/files/24694424184.pdf
    • https://cdn.shopify.com/s/files/1/0438/4410/8445/files/cultural_factors_affecting_consumer_behaviour.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_off00008fc2.bin
c62d3b05a5acb4baabd46193ee8c374a823929538480e71f54efff0b0bd00c87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC2 5368 bytes
font_01_sfnt_off0000a20a.bin
b55adf7caeedd2e8442baafe5df2e425e1d7c628963aea0cf12a7a10438b97eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA20A 10088 bytes
font_02_sfnt_off0000c48f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC48F 4324 bytes

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