Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc8eee5c7a5fe1f…

MALICIOUS

PDF

39.8 KB Created: 2020-09-08 22:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12394b83fa46e3231d94090479950bc7 SHA-1: 1bc15d8b28f51bf127edab6dd06fc9ac4c1e9747 SHA-256: 8cc8eee5c7a5fe1fd88e1fb772046311fea626ec89ceabd0dda07a144c99d9f0
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a redirector service (ttraff.club). This indicates a link farm strategy, likely intended to obscure the final malicious destination. The presence of a known malicious redirector URL and the ML classifier's high confidence score support this assessment. The document body itself is heavily obfuscated and contains the primary malicious URL.

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=dabbe+4+cin+%25C3%25A7arpmas%25C4%25B1
    • https://cdn.shopify.com/s/files/1/0436/9409/6539/files/operational_risk_definition.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/resume_cheat_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/91237085360.pdf
    • https://cdn.shopify.com/s/files/1/0434/5842/9089/files/ki_bikini_body_training_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/doxinemowifoxukeramiga.pdf
    • https://cdn.shopify.com/s/files/1/0454/3918/9142/files/32152300707.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3979/files/84364768250.pdf
    • https://static.usrfiles.com/ugd/2eedf1_393f648e27e34912a71ad0e226fa38dd.pdf
    • https://static.usrfiles.com/ugd/96768c_730c4c0f2f72434ba146093eb256591a.pdf
    • https://static.usrfiles.com/ugd/4c3d6a_53c351968d7849229f276cfbc0e794ed.pdf
    • https://static.usrfiles.com/ugd/48d9a1_33060492007741f2b62421b5c8e3226a.pdf
    • https://static.usrfiles.com/ugd/ef7b09_dc7d55352fc4426b842b64073f7f3384.pdf
    • https://cdn.shopify.com/s/files/1/0431/9179/5875/files/89438710570.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/74949000780.pdf
    • https://cdn.shopify.com/s/files/1/0450/9813/9813/files/jawufodasekiwinaper.pdf
    • https://cdn.shopify.com/s/files/1/0429/3948/2275/files/p99_paladin_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1713/files/atomic_structure_file.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_off00004db5.bin
455d3f9af663d90039aea9d59a0b0bdc5d7c8962b7916292c4db385ac3ce7168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB5 5088 bytes
font_01_sfnt_off00005e8c.bin
7f49bc743c520205dbb02127237b726fe81646ee21fc9ba2204c16ff1e8195f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8C 11244 bytes
font_02_sfnt_off00008231.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8231 4324 bytes

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