Malicious PDF — malware analysis report

Static analysis result for SHA-256 2524864adeec23ac…

MALICIOUS

PDF

63.5 KB Created: 2020-08-29 07:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deb28f99efdd880a051899b8ba1400c3 SHA-1: 5d42b0b06913f9a2e2ecbe86d9e28e5772141112 SHA-256: 2524864adeec23acf54d510dd489323baaaecbe3109712fc96e9386f9203836b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic indicates a direct link to known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL, reinforcing its role as a lure. The ML classifier strongly flagged this PDF as malicious.

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.ru/wix?keyword=working+mechanism+of+uv+visible+spectroscopy
    • https://cdn.shopify.com/s/files/1/0434/8415/1974/files/juxuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/kugepejunifon.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1411/files/servel_gas_refrigerator.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/syntactic_and_semantic_rules_of_a_programming_language.pdf
    • https://cdn.shopify.com/s/files/1/0430/8267/8433/files/submit_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/5797/0329/files/63238744631.pdf
    • https://cdn.shopify.com/s/files/1/0436/8692/0347/files/96443502511.pdf
    • https://cdn.shopify.com/s/files/1/0434/2965/8790/files/java_design_patterns_cheat_sheet.pdf
    • https://static.usrfiles.com/ugd/b8c837_09713577ce644ad68f9d70b570caef47.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc71f22b4e5b4f298e5c14a51542fe7a.pdf
    • https://static.usrfiles.com/ugd/b8c837_30cbbff6f7f64975a77cab0c48fddace.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5e9458c90b34e73960410e25f210f61.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9571/files/15442637077.pdf
    • https://cdn.shopify.com/s/files/1/0441/2493/0200/files/arrival_of_the_queen_of_sheba_piano.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4711/files/74344966403.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009627.bin
fc84306a4ab41f8a6fd14d6527984dacdb8ea337976b0ac2a59d7d61ef278c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9627 5688 bytes
font_01_sfnt_off0000a965.bin
99cc8db9d6a64a64fca82beb999c2c3d9b3064207a0ed9babbacfa7314b5b858		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA965 10548 bytes
font_02_sfnt_off0000cd9f.bin
d4bdafb1a3d3048d2fe80a290386c0c9084b07ffd15d379afe4ee8920a3aa957		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9F 16116 bytes
font_03_sfnt_off0000e27f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 4324 bytes

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