Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d96db9316b917b…

MALICIOUS

PDF

41.4 KB Created: 2020-08-20 05:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36270393b1cc8499f5431ee56c54c220 SHA-1: 7dd70464c52d4739c7a762281828eda6ec700703 SHA-256: c5d96db9316b917beabde51c6603687999a6f415a352b6ef8e5ba2682a003999
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 external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=public+speaking+tips+and+tricks+pdf'. Another critical heuristic identifies this as a PDF link farm, with 30 external PDF links. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=public+speaking+tips+and+tricks+pdf', suggesting the document's primary purpose is to redirect users 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.ru/pify?keyword=public+speaking+tips+and+tricks+pdf
    • http://wesaxeju.fbctitusville.org/uploads/1/3/0/7/130775405/tevinorupefopizineb.pdf
    • http://files.gibsonspropertyservices.co.uk/uploads/1/3/0/7/130739268/7916a38c.pdf
    • http://files.rsgymnastics.org/uploads/1/3/1/0/131071067/f07a499ee87.pdf
    • http://files.thecapacitygroup.org/uploads/1/3/1/6/131636807/sulevituj-tupelefazid.pdf
    • http://files.esthermilesart.com/uploads/1/3/1/4/131438418/4815210.pdf
    • https://cdn.shopify.com/s/files/1/0428/7548/6367/files/korutozazit.pdf
    • https://cdn.shopify.com/s/files/1/0430/0210/1923/files/gikijo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/93354112379.pdf
    • https://cdn.shopify.com/s/files/1/0434/9850/4354/files/how_to_make_forest_in_little_alchemy.pdf
    • https://cdn.shopify.com/s/files/1/0436/9137/6794/files/36627902814.pdf
    • https://cdn.shopify.com/s/files/1/0429/8312/9251/files/larezidakumezegi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/musuvagexas.pdf
    • https://cdn.shopify.com/s/files/1/0432/7371/5870/files/fegamepexesejoxezu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/borderlands_2_game_saves.pdf
    • https://cdn.shopify.com/s/files/1/0432/1614/2497/files/elementary_linear_algebra_kolman.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9605/files/tinkers_construct_dense.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/latex_problem_set_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6558/files/is_sql_object_oriented.pdf
    • https://cdn.shopify.com/s/files/1/0430/7265/1413/files/6175586081.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/
    • https://cdn.shopify.com

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006320.bin
a71807c26acd159736522885353f9a7ee989667e83095e5ceca606a29d2abb7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6320 5528 bytes
font_01_sfnt_off000075ee.bin
179f85f4f14eb68ed94c398477153b198f01fcb5be622ede70ce4650f07fedd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75EE 10132 bytes

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