Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e0c2b677632d03…

MALICIOUS

PDF

56.3 KB Created: 2020-09-01 13:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d6915b7556d1fee2c56cfdababe876c SHA-1: 249b47d7aeecb1bfc9c8089d038b46dee37cabd6 SHA-256: b4e0c2b677632d0353aa42cfcc09c7889f1222c107babb12b4c0dda509454eb4
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.club'. The document body, though heavily obfuscated, contains the same malicious URL and a title related to a bike race song, likely a lure. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector confirms the intent to lead users to harmful content.

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=gana+bike+race+song
    • https://cdn.shopify.com/s/files/1/0430/9486/8122/files/noxosubowoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/12257767828.pdf
    • https://cdn.shopify.com/s/files/1/0433/4911/5029/files/kedoxunowixubuno.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nalekubaserigudopen.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/rujanuvilazedivexanoga.pdf
    • https://static.usrfiles.com/ugd/d902bb_192af7cb83464bf49f52e7b9581b6932.pdf
    • https://static.usrfiles.com/ugd/f63f29_a75f75a6d2ec4f0cbeee26df08e34db8.pdf
    • https://static.usrfiles.com/ugd/b8c837_3003a8fbfa364b62989e451aa61fb442.pdf
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/fixiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6230/files/30_seconds_whatsapp_status_video_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0462/4442/9984/files/fogire.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006137.bin
5998e4a2d1675f830aae0de179515bca5903b7fb3c5f6bdd5ae03cacd49e7bd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6137 5168 bytes
font_01_sfnt_off000072a7.bin
c33125f2ccc4020fe04a9e34161cf2f623d2d82b057bea22f99f27d543c750bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A7 10492 bytes
font_02_sfnt_off0000905e.bin
fa98316bad0ee393e4244be63b1d230beb4724cf855be96ad4f2c87a5b302ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x905E 2140 bytes
font_03_sfnt_off00009a38.bin
74f00240fa0fbad88f403066872617438bb4094be9d3af1403d575f260f57bce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A38 10464 bytes
font_04_sfnt_off0000be23.bin
af7cf01c4c6a725149874494014cd914de25c81802524219b86a68367c829760		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE23 16224 bytes

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