Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbcdd0cd50123f0…

MALICIOUS

PDF

38.7 KB Created: 2020-07-10 15:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ea8d06d0e885a44097cdf58f643a0d7 SHA-1: 3806190224d7d59ca373e2202737173ec1553c16 SHA-256: adbcdd0cd50123f0edd8d08e55783dcb88d382d1288c8b138a804dfc029caa24
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, pointing to various external PDF files. One of these links, https://ttraff.ru/pify?keyword=easy+articles+in+english+pdf, is flagged as a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though partially garbled, contains text related to 'easy articles in english pdf' and the URL, suggesting a lure to entice users to click on the malicious links within the document.

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/pify?keyword=easy+articles+in+english+pdf
    • http://files.zwittyultra.com/uploads/1/3/1/4/131482997/zuvejebarum.pdf
    • http://files.jarpromotion.com/uploads/1/3/2/6/132681245/mevoz.pdf
    • http://files.kelseyskeys.com/uploads/1/3/2/6/132695572/c9179eb4e955.pdf
    • http://files.teachtransform.com/uploads/1/3/1/0/131070112/8266700.pdf
    • http://files.sunsetsailkeywest.co/uploads/1/3/0/8/130874170/1083a.pdf
    • http://files.theworldofmcewan.com/uploads/1/3/0/7/130738814/gibaja_tawix_wododibura_musimetal.pdf
    • http://files.mmetthey.com/uploads/1/3/1/1/131163932/mapomexowok.pdf
    • http://files.kmffa.org/uploads/1/3/1/3/131383629/8c851bb19e080.pdf
    • http://files.ppshowjumping.com/uploads/1/3/1/8/131871467/1e60616c56ab88c.pdf
    • https://segokowiw.files.wordpress.com/2020/06/49373850780.pdf
    • https://duwadunox.files.wordpress.com/2020/07/govozerojeve.pdf
    • https://fatowil.files.wordpress.com/2020/07/80794464997.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojezurin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44484222312.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41718344304.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/87007986989.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71860998709.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a75.bin
e829da010b71b5b5c5cdfe50767490c025f22f9f4e10be6f4307d8058e0c36e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A75 5156 bytes
font_01_sfnt_off00006bf2.bin
5b23aa96b506143d2d629f2841ff6a967140341447e03f8999330de822e2facf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF2 9936 bytes

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