Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbf9005d1c69489…

MALICIOUS

PDF

46.4 KB Created: 2020-09-04 06:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dd80e179ce606a2a4fefe2d113d7ef4 SHA-1: 4e851f6952a9eefb566e390bbd6f0ab71775d706 SHA-256: 6bbf9005d1c69489952b508ae64b3edcd60f92aff3a2540e2740ec0d82b6375d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.club/wix?keyword=cbec+full+form+in+gst'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous other PDF links further indicates a link farm strategy, likely for SEO poisoning or traffic generation to malicious sites.

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.club/wix?keyword=cbec+full+form+in+gst
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/b8c837_e125ae4e91294d01ae199ca72fba06ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_3af5d69f79524033a29d31b85a9af94a.pdf
    • https://static.usrfiles.com/ugd/de65f7_34814280389a4c56ad6d4ef3e45c928f.pdf
    • https://static.usrfiles.com/ugd/a0905b_7675b1d65dd7411fb3a2bcbe92af0be6.pdf
    • https://cdn.shopify.com/s/files/1/0430/7261/8657/files/12247084891.pdf
    • https://cdn.shopify.com/s/files/1/0429/0134/0319/files/kujaxuwoveterafofakosi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7264/3491/files/criminal_minds_omnivore.pdf
    • https://static.usrfiles.com/ugd/6d59ab_5f8cda08d43d4788b538b2a67caa8b09.pdf
    • https://static.usrfiles.com/ugd/c81504_43a3db7addbf44629c58eb2af9728d55.pdf
    • https://static.usrfiles.com/ugd/ab63e3_04ab4788ac72486286ab67cf7605e89f.pdf
    • https://static.usrfiles.com/ugd/d2751c_1a59078ea62d4b139d41e84556527ee5.pdf
    • https://cdn.shopify.com/s/files/1/0437/7860/5210/files/putesabujimetita.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2072/files/12898331690.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000649b.bin
43f079f830f5d7c6bc62828e6fc72dc1f0cde374742c8fe5d512136c87792b4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x649B 5036 bytes
font_01_sfnt_off000075a6.bin
ab35d358f74efc252a8d68b69ce77aa39de904e97d938b6dd9a40a5ee5f5fa98
pdf-font-stream PDF embedded font (sfnt) at offset 0x75A6 10032 bytes
font_02_sfnt_off00009836.bin
77addc7dc1ffd5e8a8883de439179033480211902ca0b4d1ff4334637d819482
pdf-font-stream PDF embedded font (sfnt) at offset 0x9836 5732 bytes