Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9b37798cb4eca9…

MALICIOUS

PDF

52.2 KB Created: 2020-08-29 12:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36eab69be43b9c2af84880a93d2f1e27 SHA-1: 01a2ecbfdd7be1ecf22fc80b6dc491f3ab45172e SHA-256: cc9b37798cb4eca90da8350a3775b10b106a7914bed5c148505f93ef84981c12
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying a link to a known malicious redirector. The document body contains the same URL, suggesting it is the primary lure. The PDF also contains a large number of external links, many pointing to Shopify, which is indicative of a link farm used for SEO poisoning or to obscure the malicious redirector. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=thomas+calculus+exercise+answers
    • https://cdn.shopify.com/s/files/1/0445/9390/5828/files/meteorology_today_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/9726/8128/files/logub.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/tudefajorelebutazi.pdf
    • https://cdn.shopify.com/s/files/1/0436/5962/4606/files/amebas_tratamiento.pdf
    • https://static.usrfiles.com/ugd/b8c837_81611af586b04fcfa36ba52566eaba96.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae2353dbd8ff440390744f326616ca06.pdf
    • https://static.usrfiles.com/ugd/dd4472_0a2b7ab302954725a17fc0cde9ee0185.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ccba908413f4b75b4dbe3ec35274bd2.pdf
    • https://static.usrfiles.com/ugd/067ecb_e93477d8d30d48e7a2a94b8b797835ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_4646e54ddc0649e38460ee08418bcde8.pdf
    • https://static.usrfiles.com/ugd/b8c837_54006e7f050844a7b4ee4e91129b97e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_f97fa90c669740a3bcc3e42ca525cfbf.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e4edeb7eac9486495861ed7cc940004.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f200ab4ebdb4b10b98f773635ebf639.pdf
    • https://static.usrfiles.com/ugd/b8c837_af9f47ef1d0647a697260afccf296c92.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_off000083f9.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83F9 2828 bytes
font_01_sfnt_off00008df3.bin
99ae1bd9528fc1fa9578b1ac83cd7bc442b49368ad2d8572b84083299865722e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF3 5148 bytes
font_02_sfnt_off00009f5c.bin
4b2e411139069eaec10ed9b4f23a7c8e41f7f162b958f76a92f7e1a2db1188a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F5C 9940 bytes

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