Malicious PDF — malware analysis report

Static analysis result for SHA-256 8176ad622c04ac76…

MALICIOUS

PDF

39.0 KB Created: 2020-08-31 05:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21e6509cee855b02ed95e69512a38c6c SHA-1: 795c9f071926d785abca711cab4bbdd660af05cc SHA-256: 8176ad622c04ac764b8a2f823e270d568d52c5efe7c166fea8a09579d85df03d
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, https://ttraff.com/wix?keyword=manual+de+fotografia+nikon+pdf, points to known malicious redirector infrastructure. The presence of a large number of links, many of which are to external PDFs, suggests an attempt to manipulate search engine results or to distribute malicious content through a large number of seemingly benign documents. The ML classifier also strongly flagged this PDF as malicious.

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=manual+de+fotografia+nikon+pdf
    • https://static.usrfiles.com/ugd/2f8cea_0d58a07a820a4d25bbc989eb9b5f9d0a.pdf
    • https://static.usrfiles.com/ugd/cc03df_2dc386ffda9b42deb72887ff57b8fac6.pdf
    • https://static.usrfiles.com/ugd/36f25b_6da1c279a1744a60969a6801fc5d7223.pdf
    • https://static.usrfiles.com/ugd/5b5da7_a0b695df284f4fb08778f7b3ba637d4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_db3c08653dbf460793325522e1576ce8.pdf
    • https://static.usrfiles.com/ugd/b8c837_1419705ab4874e0bac4a3c4176785338.pdf
    • https://static.usrfiles.com/ugd/0c41e7_c8a25917a618467f83ef174cb9e8475b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bccd6a9c70c48b3ae72f07ad2df43aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e31b88086104db29415b86c1fade428.pdf
    • https://static.usrfiles.com/ugd/b8c837_1fd0bdb4ea354122ab036d196f5a9c5b.pdf
    • https://static.usrfiles.com/ugd/d55797_62c54b6f47d3467dacf24f0d40d19114.pdf
    • https://static.usrfiles.com/ugd/b8c837_44ee9e6a51354724945d84025c0f908b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8ad3ecf65584627bc5e3562a191cc8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c53fce6494ad447ebf461da4fc0fe626.pdf
    • https://static.usrfiles.com/ugd/e3834b_b2c108adf1224e2f826b2bc4c05ba812.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_off00005a63.bin
3130e5a3d581c0db097303a0495efbebecf5e11168b04f217a210154c53c3350
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A63 5100 bytes
font_01_sfnt_off00006bd6.bin
1f2ba017953c1f0ae69668be4eefcd792eba3ebe494dd249fca2fa96404c965b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD6 10768 bytes