Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d575730a4408a85…

MALICIOUS

PDF

42.9 KB Created: 2020-09-19 10:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13ab49d8f9449c42709ddbcb1a0f3ebd SHA-1: 6846dca75b7d1a3b92832f6d4b64d93d9200520b SHA-256: 7d575730a4408a857a2c026364d8e89b279806a2edc429dde8de9ad2a592b79c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=g%25E1%25BA%25A1o+n%25E1%25BA%25BFp+g%25E1%25BA%25A1o+t%25E1%25BA%25BB+t%25E1%25BA%25ADp+108'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links to other PDF documents. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL.

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.me/wix?keyword=g%25E1%25BA%25A1o+n%25E1%25BA%25BFp+g%25E1%25BA%25A1o+t%25E1%25BA%25BB+t%25E1%25BA%25ADp+108
    • http://files.catlinsdiscoveries.com/uploads/1/3/2/7/132712323/mowaj.pdf
    • http://vipekoz.holistichealingspa.com/uploads/1/3/0/8/130873995/39183.pdf
    • http://rawozeref.debbieyoung.co.uk/uploads/1/3/1/4/131406798/8193974.pdf
    • http://pawuze.outofthedarknessministry.com/uploads/1/3/1/8/131857090/827e6b0b6982f.pdf
    • https://ab25de4c-3fa7-41c9-9194-8520f64d2c14.filesusr.com/ugd/2274a7_9897960c5fc5494587b94edc8ab13667.pdf?index=true
    • https://a3ec7824-9e52-4b1f-b1e0-159ac94220b0.filesusr.com/ugd/cd1d52_4628f356209d4746900d15c199800fbc.pdf?index=true
    • https://91712619-9ce0-460f-8a1c-3202fdbd2ba4.filesusr.com/ugd/9c8fb9_852c8b011fbc470088cc74e2431b0ab4.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/0981/8272/files/79341688581.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8402105605.pdf
    • https://cdn.shopify.com/s/files/1/0434/5734/7749/files/83593986651.pdf
    • https://cdn.shopify.com/s/files/1/0479/4685/8652/files/62045475324.pdf
    • https://cdn.shopify.com/s/files/1/0435/1832/8991/files/46263884235.pdf
    • https://2a0c804f-fc00-4916-a457-7da31965b1ea.filesusr.com/ugd/6fd45c_7fa26d88b1e145dfb1587ae468d0b13d.pdf?index=true
    • https://6cdcb771-820a-4583-877e-6bea40641132.filesusr.com/ugd/e1d12c_4b4edc50ecb94248ab2dae3473e3e40a.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_off00005c5b.bin
0b1895c0f8cdf87a019d28212001cd6b469e69be86a2562f61b78a1ea5c02cbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5B 5720 bytes
font_01_sfnt_off00006ec4.bin
d569fdb0d892680881ccd20dd6c81523e00bc0ffd8d2c255b9efdc74f1668214		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC4 21612 bytes

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