Malicious PDF — malware analysis report

Static analysis result for SHA-256 8627885641cfaaeb…

MALICIOUS

PDF

36.5 KB Created: 2020-08-16 23:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfc7a622b6d6291031f47527c1d76bed SHA-1: 4d2dd1d5e406824e57b17f5fe50f651d046e6660 SHA-256: 8627885641cfaaeb95ad432365edde996dc6ecf00053faf09c695811f09565e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged for containing a large number of external links, many of which point to a redirector service. This suggests a link farm or SEO poisoning attack designed to either boost search rankings or redirect users to malicious content. The presence of a known malicious redirector URL further supports 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.ru/pify?keyword=patola+bohemia+song++mp4
    • http://files.rxalens.net/uploads/1/3/2/6/132696145/furojexuz.pdf
    • http://files.msmossislit.com/uploads/1/3/0/8/130814205/6223211.pdf
    • http://zonidu.rickysaputrayoga.com/uploads/1/3/1/1/131164239/3965085.pdf
    • http://files.thesaltbarmacclesfield.com/uploads/1/3/1/3/131381288/1935105.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/vojigamovegozetapesuso.pdf
    • https://cdn.shopify.com/s/files/1/0433/8148/9813/files/class_d_audio_amplifier_design.pdf
    • https://cdn.shopify.com/s/files/1/0434/4279/8757/files/95490474325.pdf
    • https://cdn.shopify.com/s/files/1/0437/2883/0632/files/52127885763.pdf
    • https://cdn.shopify.com/s/files/1/0447/9506/8565/files/a_christmas_alleluia_chords.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lagikemirulufuwetore.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4455/files/java_spring_4_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0439/2583/1835/files/jemow.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/1092321220.pdf
    • https://cdn.shopify.com/s/files/1/0429/3348/5727/files/pobapizuwuseximupudedosa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9762/files/tumopiligovexupavufowo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9331/9079/files/wuwimedojawibegajuluzix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044b8.bin
ddfab6c8a656c2590d53e7be5fc8333585189823efd3c7cf0da2967423bc7f16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44B8 5152 bytes
font_01_sfnt_off00005614.bin
95768b2e8acd5a0d0c80a777a5d1c958fd7ef7202495ff12c53b0159237924fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5614 9592 bytes
font_02_sfnt_off000076fa.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76FA 4324 bytes

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