Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1c00c0194e46c7…

MALICIOUS

PDF

42.7 KB Created: 2020-08-12 00:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9433708e21e9dd7b7478fd341665a19 SHA-1: 10fca22c1cb426b3c32ff273c9f492da12f69351 SHA-256: 6d1c00c0194e46c73f735cd0dc9a3a90aeaa09a16eef9ef3160a8054421635a4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body itself contains text that appears to be SEO-optimized keywords related to educational materials, likely intended to disguise the malicious intent. The primary goal seems to be directing users to potentially harmful websites through a link farm.

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=anatomy+and+physiology+coloring+workbook+answers+cardiovascular+system+pdf
    • http://files.eaplab.eu/uploads/1/3/0/7/130740127/2255032.pdf
    • http://tutukak.norighttokill.org/uploads/1/3/0/8/130813366/e65ac7da76.pdf
    • http://tebesifum.desainergrafis.com/uploads/1/3/1/8/131871991/3989b76ec0.pdf
    • http://fukiti.ms158qmusic.com/uploads/1/3/1/1/131164250/502907.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5712/6295/files/943791099.pdf
    • https://cdn.shopify.com/s/files/1/0437/5071/9642/files/social_security_form_ssa-_521.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/bubugaratimib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/dutorafawifazed.pdf
    • https://cdn.shopify.com/s/files/1/0437/2011/4331/files/99464395126.pdf
    • https://cdn.shopify.com/s/files/1/0430/2854/5693/files/base64_to_conversion_online.pdf
    • https://cdn.shopify.com/s/files/1/0441/3338/4344/files/liberia_history_since_1980.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6059/files/64023442042.pdf
    • https://cdn.shopify.com/s/files/1/0432/4674/7803/files/44013292819.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2799/files/kukodugaxisejemuxakavu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1212/0998/files/tutorelejofixap.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/pewdiepie_minecraft_server.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_off000064bb.bin
859b8b7fc0f7caa8c7b88d6f31003b437dad1e5477319cb20ad550339852fb58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BB 6016 bytes
font_01_sfnt_off0000791f.bin
d2e4884bdfd4168da4cb9f2561625b083938807c84fffb2eff9f33b4d1104dce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x791F 10480 bytes

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