Malicious PDF — malware analysis report

Static analysis result for SHA-256 695adec96aa03767…

MALICIOUS

PDF

53.3 KB Created: 2020-08-07 00:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c27b050a489e065a02a034f0efd3afbb SHA-1: 106012cd875ddcbb3a74ee76daf25cd259b53c80 SHA-256: 695adec96aa03767ab2e85f8c7ea2dc4f0f9330557020cb700670c7c980fdfcf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. It also exhibits characteristics of a link farm, embedding numerous external PDF links, many of which are hosted on Shopify. The primary malicious URL is 'https://ttraff.ru/pify?keyword=ammonia+vapour+compression+refrigeration+system+pdf', which is likely used to redirect users to a malicious site. The document body, though heavily obfuscated, contains this URL, reinforcing its role as a lure.

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=ammonia+vapour+compression+refrigeration+system+pdf
    • http://files.happytaskservice.com/uploads/1/3/0/7/130775743/8b6b2.pdf
    • http://files.dianastem.com/uploads/1/3/0/7/130775520/rezej.pdf
    • http://files.benedictusdeus.com/uploads/1/3/0/8/130814711/wekofexunoda_bonud_wukepaz_tipazupawigo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/6617235000.pdf
    • https://cdn.shopify.com/s/files/1/0439/3399/1080/files/engineering_mechanics_dynamics_8th_edition_meriam.pdf
    • https://cdn.shopify.com/s/files/1/0437/8991/0165/files/cadential_64.pdf
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/bukijivovunafexeduju.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/list_of_state_capitals.pdf
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/difference_between_bivariate_and_multivariate_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0432/7954/8580/files/69606193488.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/gigukomobekafalorulorun.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/74152975595.pdf
    • https://cdn.shopify.com/s/files/1/0439/4532/8808/files/east_coast_roadmap.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/32206850972.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_off000091e4.bin
b11621c248a51beb870a09daf60cc4623367cd5be083d5e7690726726662718d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91E4 5592 bytes
font_01_sfnt_off0000a4df.bin
44bb15861eb2780aab975288cb0d1ea2580a7f13ae26e30cbae8bfb0140042b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4DF 10260 bytes

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