Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfbf6772063b5c8…

MALICIOUS

PDF

41.6 KB Created: 2020-09-01 03:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6402582886399aec3a37cf739df5770 SHA-1: 51f3acf36e19cbdea99d4b27bae76daf92319632 SHA-256: cbfbf6772063b5c881bbba4bff7c3c8e1505b3f3722b332c0ef5888bbcfe2ecc
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, https://ttraff.cc/wix?keyword=canon+in+d+violin+free+pdf, disguised as a free sheet music download. The document body, though heavily obfuscated, contains this URL and other benign-looking PDF links, suggesting a link farm used for SEO poisoning to attract victims. The ML classifier strongly supports the malicious verdict.

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.cc/wix?keyword=canon+in+d+violin+free+pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7476/files/hitchhiker_s_guide_to_the_galaxy_answer.pdf
    • https://cdn.shopify.com/s/files/1/0445/4960/3487/files/ntsi_defensive_driving_course_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0812/2270/files/buvopubakumevojupagimes.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/whistleblower_transcript_document.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/facebook_auto_liker_for_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/15245657935.pdf
    • https://cdn.shopify.com/s/files/1/0429/5789/7882/files/9312758652.pdf
    • https://static.usrfiles.com/ugd/ee4a13_6b5590eebfa44ce69f10c8dbb32b1d2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_588aa9cf2e3047d2b8977cb0b5e6467a.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_off00004e50.bin
46db7aed1ad5d5d8de4397f9af648f6bb9ab24341397f951b12d74d210119c2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E50 4824 bytes
font_01_sfnt_off00005ecd.bin
ed41fe692bba659040c3d80b88df54fd1c58a9647f7dcb75834389cc74051da9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECD 10652 bytes
font_02_sfnt_off00008386.bin
fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8386 16120 bytes

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