Malicious PDF — malware analysis report

Static analysis result for SHA-256 805d6c640bdca96c…

MALICIOUS

PDF

47.4 KB Created: 2020-08-31 12:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d20e937cb4612f2648edc8cdd85e079 SHA-1: ddfe7a3eac8a3b3300b8cdf42b4a3ec249c5e243 SHA-256: 805d6c640bdca96c869f857a1afa87255efcc458aa425e3238275fcb037b1cbc
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are benign but likely serve to obscure the malicious one. The presence of a 'download button' lure further supports a phishing or scam attempt. No scripts were extracted, but the embedded malicious URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=appreciation+mail+format
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_042ded1c11234268b377a95cc34b3e07.pdf
    • https://static.usrfiles.com/ugd/575363_b5a4d6e9cc084f6d99a9514c21423872.pdf
    • https://static.usrfiles.com/ugd/72216b_7cc50bfe6886459e9012b15bbeb7d3bb.pdf
    • https://cdn.shopify.com/s/files/1/0434/1766/5703/files/22597819171.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/69287419621.pdf
    • https://cdn.shopify.com/s/files/1/0440/7413/9813/files/muwimuwirokexisetuvevol.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/international_economics_robert_carbaugh_14th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/4116/0344/files/dress_up_worksheet_printable.pdf
    • https://cdn.shopify.com/s/files/1/0430/4230/8250/files/alchemy_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/1036/6362/files/zijefujosomiposi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6047/8630/files/electron_configuration_worksheet_answer_key_chemistry.pdf
    • https://static.usrfiles.com/ugd/1be480_68b68102cd6e4b97b70374816e483cf7.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bf3d8c6071a45e3a927d926aac3c04e.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007658.bin
ff726e3730d20b9e9601f0a8a0a3c56d6c0029644d4ce3ad91fe91f634570d68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7658 4972 bytes
font_01_sfnt_off00008728.bin
a597bce3dc44a05097128b53cdd5f00d7904259ce5bd649b769b1daefcd7782b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8728 13284 bytes

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