Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af31201f27c9790…

MALICIOUS

PDF

43.6 KB Created: 2020-09-07 17:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09da4b727b178215306aef91bd3085da SHA-1: 3ac6208d84d05fa05f5113cb81f4a27f91207fe4 SHA-256: 3af31201f27c97900cce2b350dff713d3381340e2c1eb3b6f14e3b3db03da8f2
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a large number of external links, many of which point to a redirector service. The document body contains the URL 'https://ttraff.link/wix?keyword=b+d+f+full+form', which is also listed as a malicious redirector link. The presence of a link farm suggests an attempt to lure users to malicious content.

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.link/wix?keyword=b+d+f+full+form
    • https://static.usrfiles.com/ugd/e5412a_ecccbea4e28444beb14ca94f1be970e9.pdf
    • https://static.usrfiles.com/ugd/7603ae_338138cae72148aebbf2af6d7b134ae6.pdf
    • https://static.usrfiles.com/ugd/96768c_e3abda15a9fd444e825d6429aa931cc6.pdf
    • https://cdn.shopify.com/s/files/1/0431/4464/2716/files/business_informatics_definition.pdf
    • https://cdn.shopify.com/s/files/1/0438/4158/5314/files/free_post_apocalyptic_books.pdf
    • https://static.usrfiles.com/ugd/238140_1966c139b66149a69a4ad2f1a8d5b6f6.pdf
    • https://static.usrfiles.com/ugd/ed2d23_c31480d04fb64311ba17e6204369e140.pdf
    • https://static.usrfiles.com/ugd/cc089a_b373e7489e4a4b0bb361de8ed37e4f59.pdf
    • https://static.usrfiles.com/ugd/cec570_babaa4eea7474e84999c21d488ecfaf9.pdf
    • https://static.usrfiles.com/ugd/6dcf04_baaeff263d544a96a7f9402db63fc7d9.pdf
    • https://static.usrfiles.com/ugd/271e65_225bde3466b34204b703438c48a2d35f.pdf
    • https://static.usrfiles.com/ugd/b5aed9_77c792b88da6409f83b737ca87fe683d.pdf
    • https://static.usrfiles.com/ugd/c79b1c_48bb304e137e49f69cc5ecd372967ea3.pdf
    • https://static.usrfiles.com/ugd/536122_3aa55d50606a4a2b83b1d3719227fd7a.pdf
    • https://static.usrfiles.com/ugd/2f07a1_b5461e4cc678458592c6ff4d0b6e0063.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_off00006241.bin
8d748c94b8983ad8e6e23c88cc28a392b7b28c5947f7d90aba93b84ef6ccd956
pdf-font-stream PDF embedded font (sfnt) at offset 0x6241 4712 bytes
font_01_sfnt_off00007232.bin
103107c267668db62dc814651ffe659ba9adfd411ef96186e2394ca759d34f26
pdf-font-stream PDF embedded font (sfnt) at offset 0x7232 14800 bytes