Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e246f407eebf628…

MALICIOUS

PDF

39.4 KB Created: 2020-08-12 04:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 296f103f1beaed898c5bf40da7bc6ee5 SHA-1: 8e51b50bc71cf88bb13849d89f5701ce9138a20f SHA-256: 4e246f407eebf628a3a0687984e36269ca58a07950cb8e3e0fe7e904ae1a0df0
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector pointing to 'ttraff.ru'. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and references to 'unskilled manual worker crossword', suggesting a lure. The presence of numerous links, including a 'link farm' to Shopify domains, indicates an attempt to distribute malicious content or phish users.

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.ru/wb?keyword=unskilled%20manual%20worker%20crossword
    • http://files.wbeesnbk.com/uploads/1/3/1/4/131453268/jatinija.pdf
    • http://files.goodwinscience.com/uploads/1/3/2/6/132682897/jokutuv_piful_wubep_kesulixuvoji.pdf
    • http://files.eleven22inc.com/uploads/1/3/1/4/131437064/8279717.pdf
    • http://files.loxsalonva.com/uploads/1/3/2/6/132682106/dumapukis_rawokunata_lowasid.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5717/files/74903796205.pdf
    • https://cdn.shopify.com/s/files/1/0428/3170/8316/files/cimetidina_injetavel_bula.pdf
    • https://cdn.shopify.com/s/files/1/0430/8969/0773/files/xazigabevejadeto.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fovurasavelibegesixaga.pdf
    • https://cdn.shopify.com/s/files/1/0449/7804/5086/files/ninazonibukivule.pdf
    • https://cdn.shopify.com/s/files/1/0447/0652/9434/files/irregular_present_tense_spanish_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/6485/2634/files/yuddha_kanda_ramayana.pdf
    • https://cdn.shopify.com/s/files/1/0431/4460/9943/files/bipufa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0449/2957/files/arithmetic_by_rakesh_yadav.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/16916731120.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tesip.pdf
    • https://cdn.shopify.com/s/files/1/0435/2301/4824/files/calculus_1_11th_edition.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_off00004ea4.bin
7bfc47c813308ccbd09ab693e285ca476d5d06eb302dfd4069c210304682cd5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA4 5032 bytes
font_01_sfnt_off00005faa.bin
59d61fa9103f8220a6535936a7c21f01a12fa117e76fbfa112e5f9202cf5dcb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAA 10100 bytes
font_02_sfnt_off00008231.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8231 4324 bytes

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