Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fb2fdb7360a66c…

MALICIOUS

PDF

45.9 KB Created: 2020-08-17 00:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2eddcd6109d7f7e912eccd880865d5a4 SHA-1: c2ae3dadf42615cd86614004e151f3213bba1743 SHA-256: 73fb2fdb7360a66c99150df11fe23e82484cb564a426533b814a9e46b4305822
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to potentially malicious redirectors like 'ttraff.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to manipulate search engine results or drive traffic to malicious sites. While no scripts were directly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent.

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=unity+asset+store+s+folder In PDF document text
    • http://xefave.molliesmorsels.com/uploads/1/3/0/7/130776836/pigutupuj-nepezava.pdfIn PDF document text
    • http://files.kelleycarney.com/uploads/1/3/1/3/131379035/4045514.pdfIn PDF document text
    • http://files.consonamus.com/uploads/1/3/1/4/131406149/7738708.pdfIn PDF document text
    • http://fuvux.jar-labs.vomifix.com/uploads/1/3/1/4/131407815/rekodobosutiral.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7932/7130/files/20300292454.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3789/2509/files/43385588283.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3645/0717/files/conceptual_physics_practice_page_chapter_4_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6447/3253/files/83762175740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/47950516538.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/56857622633.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6141/9927/files/30555835327.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8475/8696/files/zuriraforadu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2169/6149/files/mp4_bolliwood_movies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/watekigojan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/4854803309.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1801/0274/files/american_pie_2_full_movie_123movies.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000761c.bin
88411a8eb752133115f89bed582df41f7b340d64e79a60571dfc47b97da496b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761C 4992 bytes
font_01_sfnt_off00008725.bin
ff5c64f0c33d04ff9a58ca7ba023d0ebd9e647f92c7ee6fd124f8f6757f17c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8725 10304 bytes

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