Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8eded92240d916…

MALICIOUS

PDF

40.8 KB Created: 2020-08-13 22:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78f2e7b4a5aa5acf1b384d648730f0e7 SHA-1: 5e074cbdd199ca6b64108276bbb42ac3f6d3b652 SHA-256: 0c8eded92240d916a7b67268bc04307e3653fef5e273fb561abdb03199cae146
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the URL 'https://ttraff.cc/pify?keyword=sound+volume+apps+android', suggesting a lure to external content. The presence of numerous PDF links indicates a link farm or distribution mechanism.

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.cc/pify?keyword=sound+volume+apps+android
    • http://files.autopoiesis.life/uploads/1/3/1/4/131453684/8070935.pdf
    • http://nolujar.shinestudiohairsalon.com/uploads/1/3/0/8/130813332/gufifidopuliwuja.pdf
    • http://files.uttxts.org/uploads/1/3/0/7/130775126/nifefifogurar-nubov-wuvonor-rezogezalofuko.pdf
    • http://files.digbytrails.ca/uploads/1/3/0/7/130738882/vujokaja_zafamen_wesejiwo_digedex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2583/3884/files/tudulirodizabebakapale.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/75590870144.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5674/files/bosquejos_de_sermones_cortos.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3396/files/jilonalesadosufuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/jakejulesumopiwapuravelu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/60457854104.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/64990194922.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6165/files/jinaxijunokubum.pdf
    • https://cdn.shopify.com/s/files/1/0431/7865/5903/files/mathematics_symbols_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0703/2990/files/42030152848.pdf
    • https://cdn.shopify.com/s/files/1/0434/3290/2806/files/gulekugakozijiposaxiran.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/20939483847.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061bf.bin
10d3a2bc3e93ad71905b9a5228b3bb6179ec7725f74a142ec7e5590cf9c0fa84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BF 5268 bytes
font_01_sfnt_off0000738d.bin
5e013f12d2bd8213e4545a8e9c225f0d71fb750c6118284ca6cc4424d9b85e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738D 10272 bytes

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