Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70d080ceabdafd3…

MALICIOUS

PDF

39.4 KB Created: 2020-08-01 20:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc469eddf826286a0e0e7caae6f50f3e SHA-1: 3f3b9ec04e4ead6b3c1fa5ad2655f9909273585f SHA-256: b70d080ceabdafd30cf9e62a01a15407dc930ed1eae68ab7967b737896937e8b
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'free timestamp server' and references to PDF files, suggesting a lure to external content. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to malicious infrastructure via a link farm.

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.cc/pify?keyword=free+timestamp+server
    • http://files.tailwaggintreats.net/uploads/1/3/0/8/130873997/1b81b2c2cf.pdf
    • http://files.billguggenheim.com/uploads/1/3/1/4/131454316/bubepep-wulonanagu-zonijeb.pdf
    • http://files.lifesultimatequestions.com/uploads/1/3/1/6/131637308/sazazakujalazurogote.pdf
    • http://files.cedsquaretu.com/uploads/1/3/1/4/131411474/e774e3ee957.pdf
    • http://files.minshengchiu.com/uploads/1/3/1/4/131436978/3198544.pdf
    • https://cdn.shopify.com/s/files/1/0434/8903/4402/files/linux_coding_style.pdf
    • https://cdn.shopify.com/s/files/1/0440/4294/4677/files/nejavefagibekikusamufusi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5651/9576/files/77580286718.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8277/files/tijarelatu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3730/1653/files/vopetowej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0848/2710/files/71012645477.pdf
    • https://cdn.shopify.com/s/files/1/0431/4726/4166/files/14108830385.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/48441663414.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/lifuzufasovex.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/xinirimiwidevurut.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_off00004edc.bin
f0d69d9ac75d47e19e22f5559785e38c9c13b41dcb383d2a68593a7be46d8eb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EDC 4520 bytes
font_01_sfnt_off00005e2f.bin
5c76312e968347921a40f29637470b511723211137aac4ccd53321dfb9a31a21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2F 10708 bytes
font_02_sfnt_off0000829a.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x829A 4324 bytes

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