Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c3d10638047afb…

MALICIOUS

PDF

49.9 KB Created: 2020-08-08 10:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dacf1f6a12c96e06ec5890411173a7dd SHA-1: 51f21ad39565218cdd47472dbd44718a7d4e773d SHA-256: f6c3d10638047afb65c0fa0ca3dd1f87b52b36352337f8922e930d7e1e5c792a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, characteristic of a link farm. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=rfid+based+prepaid+card+for+canteen+management+system+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=rfid+based+prepaid+card+for+canteen+management+system+pdf
    • http://podiba.how2bounceback.com/uploads/1/3/2/3/132302921/9000084.pdf
    • http://files.hello-baby-toys.com/uploads/1/3/1/4/131453807/4352687.pdf
    • http://files.apexmiddleschoolpta.com/uploads/1/3/1/0/131070560/zadiwuz.pdf
    • http://files.sanchezartgallery.com/uploads/1/3/1/3/131383323/5318c4.pdf
    • http://files.numptynerd.net/uploads/1/3/1/4/131437680/629798133a.pdf
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/kasopofibakizanigoxolumop.pdf
    • https://cdn.shopify.com/s/files/1/0434/0305/1175/files/bluman_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0440/8170/9206/files/tisid.pdf
    • https://cdn.shopify.com/s/files/1/0428/3554/2182/files/47023882236.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7303/files/premiere_pro_alternative.pdf
    • https://cdn.shopify.com/s/files/1/0434/3853/8904/files/wererat_dnd_5e.pdf
    • https://cdn.shopify.com/s/files/1/0430/2195/9325/files/cost_accounting_basic_concepts.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/2634169440.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0658/files/bilisake.pdf
    • https://cdn.shopify.com/s/files/1/0431/3304/2839/files/astrology_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/2740/6746/files/yamaha_xt500_service_manual.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_off00007776.bin
d7d5ad12182e69513e90cc666db39d63316d2a40349dabef0fc170507c1cead4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7776 5480 bytes
font_01_sfnt_off00008a05.bin
efdcedb278ad6d867a2d016e9840856f4c7f94d73a70ebb4e02850ac78d501a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A05 9832 bytes
font_02_sfnt_off0000abab.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABAB 4324 bytes

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