Malicious PDF — malware analysis report

Static analysis result for SHA-256 c867aa4da88cc0ba…

MALICIOUS

PDF

47.3 KB Created: 2020-09-01 00:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0317420bf16a7287d0bc5723b9a28117 SHA-1: 505d1fa3425f3b7e99e8d0b09af030afd27ebeb6 SHA-256: c867aa4da88cc0ba33ab931ffe8c68dc4720de2dd0b5164ce143a75a7b007703
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains text related to "composition of functions examples with answers pdf", suggesting a lure to disguise the malicious intent. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning and traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=composition+of+functions+examples+with+answers+pdf
    • https://cdn.shopify.com/s/files/1/0433/9610/4348/files/tanowofuxatitopoluba.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/pool_exercises_for_lower_back_pain.pdf
    • https://cdn.shopify.com/s/files/1/0428/5415/4406/files/wigorajoginixesado.pdf
    • https://cdn.shopify.com/s/files/1/0429/3489/4755/files/87800411238.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ed4421165b24ed4b9deb540ed7f09db.pdf
    • https://static.usrfiles.com/ugd/b8c837_736134fc62b3434c8c4540f03d98e100.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab6db6c9077e43ccaa1105bdd32d337a.pdf
    • https://static.usrfiles.com/ugd/b8c837_fae4bc71b46c44b0aae9655d242d7e39.pdf
    • https://static.usrfiles.com/ugd/599026_9611f0a55f224ebea1c1219b1a16bef8.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4870/files/82772563506.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/wevuvaraw.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_off00005ae3.bin
ec683efabd6114cf81411061ece46ec1bbd34288a8173781d7ef07db64ac2a13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE3 5460 bytes
font_01_sfnt_off00006d5b.bin
c0c9830affa6e12f3ffd765df78ddd7a4e620a400249387d29ea5f95b6b4a9c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5B 14516 bytes
font_02_sfnt_off00009a78.bin
069f5cdcb972b33999f3dc18a3e5b847fc2aa024b7c5b45b4734cedf253a8e5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A78 16376 bytes

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