Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edb180e19b53c60…

MALICIOUS

PDF

32.1 KB Created: 2020-08-31 00:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33535c1ad2d15ea72a375e36f858e93c SHA-1: 9839b2a0f8666e42077b0f7472e7c28aa0bcaee5 SHA-256: 7edb180e19b53c607e3f5ef25db1172ea006b221f373d9b0d1dfefaf62e71441
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a search result for a calculus textbook PDF. This indicates a phishing or scam attempt to direct users to malicious infrastructure. The PDF also contains a large number of external links, characteristic of a link farm, further supporting the malicious intent.

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+early+transcendentals+14th+pdf+reddit
    • https://static.usrfiles.com/ugd/b8c837_fcc0cc1e0227497490770403dbc9ede9.pdf
    • https://static.usrfiles.com/ugd/b8c837_114e5d7d0dcc4541a4bc9ba8b55104f5.pdf
    • https://static.usrfiles.com/ugd/5899d5_b01e7feda071408c98449f2e0f233174.pdf
    • https://static.usrfiles.com/ugd/08fe48_a2dba690e8cb4dc6b536e03048dc3744.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7997453156.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/repurezoferikudufofox.pdf
    • https://cdn.shopify.com/s/files/1/0437/0232/1307/files/types_of_freshwater_aquarium_fish.pdf
    • https://cdn.shopify.com/s/files/1/0437/5199/7592/files/63997256070.pdf
    • https://cdn.shopify.com/s/files/1/0433/5337/4874/files/29730481600.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9f18cad06e041a6baedb4428c042c3d.pdf
    • https://static.usrfiles.com/ugd/80c1db_bf1509bbfdaf4f7b9e4cad077d75de0c.pdf
    • https://static.usrfiles.com/ugd/e2c250_e8b10d9551784051883d4e772af574ec.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_off000041a2.bin
eb164b3ebdbb2f92ce2680011f4ea69716acbb695c4155eb2b2db17558e1ed53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41A2 5584 bytes
font_01_sfnt_off0000548b.bin
1620b1d1481f0b6cccf42b424576caa8d31624509c383b24e867addb1eeb28e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x548B 9064 bytes

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