Malicious PDF — malware analysis report

Static analysis result for SHA-256 686dc8f6a6a67072…

MALICIOUS

PDF

41.1 KB Created: 2020-08-11 15:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00ba068a83f42bbce75227c9da0015b1 SHA-1: 4de118178f87bb6002ba745678d55356deccfb19 SHA-256: 686dc8f6a6a6707283607bea2145e5095e76c80934b6bcded8a0e61b44da720d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.com/wb?keyword=teknik%20vertical%20rescue%20pdf'. It also exhibits a PDF SEO link farm pattern with numerous external PDF links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and other Shopify-hosted PDF links, suggesting an attempt to manipulate search results or lure users to malicious content.

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.com/wb?keyword=teknik%20vertical%20rescue%20pdf
    • http://files.megtinsleymft.com/uploads/1/3/1/6/131607467/misejasuno_movaza_situmi_jaguwila.pdf
    • http://files.mastudentnurses.com/uploads/1/3/0/7/130776607/nokogajowabobekexu.pdf
    • http://files.music.shenfieldlearning.com/uploads/1/3/1/4/131452804/supikimoniv.pdf
    • http://xufeposit.writeindanderyd.com/uploads/1/3/0/7/130776445/4673561.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/17072040473.pdf
    • https://cdn.shopify.com/s/files/1/0434/8670/7876/files/conjunctions_english_list.pdf
    • https://cdn.shopify.com/s/files/1/0451/3693/7125/files/sad_song_2014.pdf
    • https://cdn.shopify.com/s/files/1/0437/5917/3790/files/sedusafirizonewodelov.pdf
    • https://cdn.shopify.com/s/files/1/0430/1612/6625/files/34698820299.pdf
    • https://cdn.shopify.com/s/files/1/0432/6631/0299/files/algebra_examples_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7967/files/vehicle_condition_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/7918/8118/files/27653133247.pdf
    • https://cdn.shopify.com/s/files/1/0428/9688/3868/files/hanuman_chalisa_telugu_format.pdf
    • https://cdn.shopify.com/s/files/1/0435/7249/4495/files/biriwelamupadevapo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7614/8638/files/wulenimowazeke.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3576/files/56934153833.pdf
    • https://cdn.shopify.com/s/files/1/0439/3913/5643/files/malixedozegalamorepuruf.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4453/files/atira_housing_ahmedabad.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_off0000642b.bin
4fd0a3f1ccdf9dba52239ed6539001481cacc4f4f856e56662ef9c26a7e3571d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x642B 5224 bytes
font_01_sfnt_off000075fc.bin
b6f2e3b957a1a81584fa039fe9ebfa218789dfc10aadb3e325039e437cd903de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FC 9808 bytes

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