Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6440ac609c7f8e…

MALICIOUS

PDF

37.2 KB Created: 2020-08-21 03:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 137752fa62d9f569591917fe3c714036 SHA-1: 8933c951848508801d3dd99a87a6520532a15c9c SHA-256: be6440ac609c7f8e0579df10c8da6c0385071cdf71c96a92445559d2ac8c1612
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The document body contains a URL that points to a known malicious redirector, which likely serves as the initial entry point for a phishing or malware distribution campaign. The presence of numerous external links, many hosted on seemingly benign platforms but pointing to potentially malicious destinations, reinforces this assessment.

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=aankh+marey+ringtone++zedge
    • http://files.rhinotruckparts.co.uk/uploads/1/3/1/4/131406104/roleduvibudapebov.pdf
    • http://juvavas.techniprodec.com/uploads/1/3/1/4/131438405/wovinilavuvega_makegusupe_wojufijipasese_jerumavivu.pdf
    • http://files.mil2civmentor.com/uploads/1/3/1/4/131452741/fb1e50a4f7ef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54183348773.pdf
    • https://cdn.shopify.com/s/files/1/0452/5637/6480/files/opposite_words_in_english_a_to_z.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/66726016206.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/5029133479.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/smash_4_battlefield.pdf
    • https://cdn.shopify.com/s/files/1/0430/8864/2197/files/damumusexizu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0722/1661/files/random_string_generator_c.pdf
    • https://cdn.shopify.com/s/files/1/0439/1862/2875/files/xunijuvebirowuxolox.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5750/files/casio_hr-_100tm.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/42733405079.pdf
    • https://cdn.shopify.com/s/files/1/0437/4197/0583/files/introduccion_al_budismo_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3164/1762/files/meligedukas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046f9.bin
4423590ab0fbdc821faeea54e1a621c6f5bc588a8283309fc6ed2bea8dee8b1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46F9 5020 bytes
font_01_sfnt_off000057e4.bin
5ab3f7bc79ef321106d4b178a9bebe45713d272605a86236879766674668ad96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57E4 9984 bytes
font_02_sfnt_off00007a23.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A23 4324 bytes

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