Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b497b011c2ac35…

MALICIOUS

PDF

41.7 KB Created: 2020-08-29 12:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d666bcfe271b2ffeba17ad4f76a7abc2 SHA-1: 23c485a579e89a89681d2b50446502e5c2cfe375 SHA-256: b1b497b011c2ac35d7a4387e1b87296221e13afc8f7f3c1362da6b27e52fab74
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with a critical heuristic firing indicating it's a malicious redirector. One of the primary URLs, 'https://ttraff.ru/wix?keyword=conjuros+del+rey+salomon', is flagged as malicious. The document body, though heavily obfuscated, also contains this URL, reinforcing its role as a lure. The ML classifier also strongly indicated maliciousness.

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=conjuros+del+rey+salomon
    • https://static.usrfiles.com/ugd/89363e_d1e18d5757234072ba4cab9519b42ad7.pdf
    • https://static.usrfiles.com/ugd/b8c837_88df5c8725814e8daedac952781e8b81.pdf
    • https://static.usrfiles.com/ugd/166c09_a4788eb67d114ab8a079c637e51bdad4.pdf
    • https://static.usrfiles.com/ugd/b8c837_771c7bb782ae4ffabacd897664d6389f.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf52e3c9035c4fc5ba97cdc78f330aad.pdf
    • https://cdn.shopify.com/s/files/1/0437/9344/9122/files/povijefisebimalutomorur.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/74417029112.pdf
    • https://cdn.shopify.com/s/files/1/0434/7923/6774/files/media_query_css.pdf
    • https://cdn.shopify.com/s/files/1/0437/7827/7527/files/vocabulary_personality_adjectives_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/8011/3562/files/airway_management_devices.pdf
    • https://cdn.shopify.com/s/files/1/0440/0647/3886/files/wugelej.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/fizabefepuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/recuva_gratis_en_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0433/7818/0261/files/angle_of_repose_stegner.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006578.bin
2302b11148f1e2fba1c3474d6e4193a885a93e127389a9b96d267834d4007f77
pdf-font-stream PDF embedded font (sfnt) at offset 0x6578 5052 bytes
font_01_sfnt_off00007695.bin
e86f3a528e39fd527b90e963b3ec6e42150af428e5d197cbea553da601201bd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7695 10820 bytes