Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b320aa856b7b72…

MALICIOUS

PDF

41.8 KB Created: 2020-08-07 15:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0bb8947e38a225c0cb831733fd0e1e0 SHA-1: 952162efa592441cb211fd31349b2393ed6c9e0f SHA-256: 34b320aa856b7b72722258d6cc0a430df21e426867cd7d99cbb82b17d94446be
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector infrastructure at ttraff.ru. The document body contains garbled text but includes the same malicious redirector URL and several benign-looking Shopify URLs, suggesting a lure to disguise the malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=pdfbox+add+png+image+to+pdf
    • http://files.c3edu.org/uploads/1/3/1/6/131606346/1812332.pdf
    • http://files.advantureusa.com/uploads/1/3/1/1/131164185/944c18a09ad0931.pdf
    • http://files.thenavigatorprogram.org/uploads/1/3/2/6/132682210/vebil.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3128/files/54050536440.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/ladugeru.pdf
    • https://cdn.shopify.com/s/files/1/0429/5173/7498/files/pdf_writer_bytearrayoutputstream.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7141/files/cadillac_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/xavojisifuroruzi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/98674031373.pdf
    • https://cdn.shopify.com/s/files/1/0448/1276/3298/files/reparacin_y_bobinado_de_motores_elctricos_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0437/2761/8209/files/pdf_tool_merge_split_watermark_encrypt.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/worimesakevofuwufafadu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/surorut.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_off00006671.bin
04e4c5295334fbf17c78d0caac2523511642bf8fbce8865332367a67f3719e9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6671 5264 bytes
font_01_sfnt_off00007857.bin
7ba8ab874303abf410ae6a12fb8f790ebd36f76bdf2f122a0dd237953ebb1aca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7857 10280 bytes

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