Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97efc8a533199ee…

MALICIOUS

PDF

47.9 KB Created: 2020-08-03 02:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1857bcca47cad323d91dfc485c3dfa0a SHA-1: 538c8ee765c45db4769a3c1843efcedc04bad9b7 SHA-256: a97efc8a533199ee565471f01899ab98e19b8afc771e21a0988002a11904a30d
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, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted from this sample.

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.com/wb?keyword=proof%20by%20contraposition%20examples%20pdf
    • http://files.goldenstatesurrogacy.com/uploads/1/3/0/7/130740112/lesivalobofavo-dulifosajux-gugadi.pdf
    • http://files.mx.youngstaekwondo.net/uploads/1/3/0/7/130739387/7151198.pdf
    • http://files.acupunctureworkswonders.com/uploads/1/3/0/7/130739027/612eb68.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3301/files/74271322727.pdf
    • https://cdn.shopify.com/s/files/1/0440/4166/6710/files/domowaxutifitugosazor.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/10163270389.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/99362670205.pdf
    • https://cdn.shopify.com/s/files/1/0431/2648/9249/files/2597779946.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/jufogojitokosavig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0956/4064/files/76376837776.pdf
    • https://cdn.shopify.com/s/files/1/0432/1987/8048/files/greyjoy_family_tree.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/dodge_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/waxigulazatep.pdf
    • https://cdn.shopify.com/s/files/1/0432/2125/4312/files/39736670904.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8642/files/pokizevavosabux.pdf
    • https://cdn.shopify.com/s/files/1/0432/4887/7736/files/27347874728.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a4e.bin
17792dcf05e8a084718b615d7b19e68a05f22b80eabd03f15e221605c73afaa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4E 5400 bytes
font_01_sfnt_off00006c8c.bin
2ac3844d9915f4fec3e68eb867cb3ab68a75a55127c7fa9753ae1df252e5e306		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8C 9940 bytes
font_02_sfnt_off00008ec6.bin
239a3a4a3060670897ac50d8e859cc50fc808890992ee37fdfdb3b2d9df49b0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC6 16148 bytes
font_03_sfnt_off0000a3ce.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3CE 4324 bytes

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