Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c10a115b5c26fa4…

MALICIOUS

PDF

46.2 KB Created: 2020-08-29 20:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8ddef9020db274eb7ed21c0e826f79f SHA-1: eacbbe8945ffcc8c5fa13eaca50108877349f570 SHA-256: 1c10a115b5c26fa46ac7159da7b66daa5907c2e3083a2cb061fe59313a8563bc
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs, including a critical redirector link to 'ttraff.com'. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains the target URL, reinforcing the attack pattern.

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=doubleday+large+print+book+club
    • https://static.usrfiles.com/ugd/b8c837_5e363015ff504085a3de576f5df0ec33.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0d94ff95558444b8022f497068e32ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_3853946d01894217bf58c5ea9bbbd60f.pdf
    • https://static.usrfiles.com/ugd/ed64d2_720e44868fbd49f58f6838d978376984.pdf
    • https://static.usrfiles.com/ugd/4b68be_7943a48bcae84df3ade9f000bfb5fc7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9631e454f8c64eb89350741a13eb1129.pdf
    • https://static.usrfiles.com/ugd/b8c837_e62cfd464b1a416fb85931d185a71ad7.pdf
    • https://static.usrfiles.com/ugd/b8c837_9171afc45e8b4b4cacd8a07933505dd2.pdf
    • https://cdn.shopify.com/s/files/1/0440/5621/5702/files/jingle_bells_hip_hop_remix_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/addictive_drums_free_pc.pdf
    • https://static.usrfiles.com/ugd/b8c837_a50be68bc346417ca75718a38f8bd66e.pdf
    • https://static.usrfiles.com/ugd/b98abb_2193c72c5d6948aeb3ef0fdc96d6c962.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8679ef925f6435684dc6b9c5758c7d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_984aba8673e94f28b01643f7eb643778.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_off0000748f.bin
53175a45eac3a268ab884b2dc443ddc7c589861d6592f3ec650e355221c7b7d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x748F 5368 bytes
font_01_sfnt_off000086e3.bin
f1219e0354e061fa9e6a24ce101c68b81e4d8dbdc8e4b731c1d5171340b81c6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x86E3 10548 bytes