Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebef32c23487c635…

MALICIOUS

PDF

69.1 KB Created: 2020-07-19 21:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20f0132dc384458aa098566d788ea4b3 SHA-1: fe80e3f5a1b0c39a192973c5565fb361d98fcd9f SHA-256: ebef32c23487c6352034cad7ade18dd7bfc517158801f53a3eb6868942e2fa76
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to suspicious domains and are indicative of a link farm or redirector strategy. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to academic writing resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wb?keyword=writing%20academic%20english%204th%20pdf
    • http://files.davidgovertsen.com/uploads/1/3/1/3/131380467/ea9fb2ad016.pdf
    • http://files.haralsoncountyhistory.com/uploads/1/3/2/3/132302913/4438840.pdf
    • http://files.mrjcostello.com/uploads/1/3/2/7/132711983/6610048.pdf
    • http://files.johnguillory.com/uploads/1/3/1/0/131070291/kagak_xozoxagiparo_ligabolurodume.pdf
    • http://files.greatgrace4u.com/uploads/1/3/1/4/131483685/5ebff999f3d38.pdf
    • http://files.truebluefishing.co.uk/uploads/1/3/0/9/130969270/9116c8462e64.pdf
    • http://files.americasschoonercup.com/uploads/1/3/0/9/130969404/8255926.pdf
    • http://files.didsburyjuniors.com/uploads/1/3/2/6/132681824/maxipupamekep.pdf
    • https://zumoxagi.files.wordpress.com/2020/06/26325832125.pdf
    • https://gelepulag632881419.files.wordpress.com/2020/06/59593383950.pdf
    • https://karudike.files.wordpress.com/2020/07/23996818841.pdf
    • https://momudun.files.wordpress.com/2020/07/23438061125.pdf
    • https://cdn.shopify.com/s/files/1/0429/4947/6518/files/kidozijefosesivazepuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/0921/9492/files/2693473837.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/42576635151.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8375/files/18201044424.pdf
    • https://cdn.shopify.com/s/files/1/0430/3021/6855/files/82297799188.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1735/files/25737704982.pdf
    • https://cdn.shopify.com/s/files/1/0433/5268/6742/files/61295457652.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3019/files/kesem.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/87033029494.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_off0000ccc9.bin
97a5d388298f4be01e681f174e03297a826fca8fc99685b55fe73f9e2345f29c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC9 5348 bytes
font_01_sfnt_off0000ded2.bin
98ea58cd7141cfa740ee9dec9b28ed39ba2815ddbce2322f47639f59bbf056fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 12220 bytes

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