Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b51cd7c564a0fe5…

MALICIOUS

PDF

41.2 KB Created: 2020-08-06 20:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbad8fbf14b0707f40b19db9020042de SHA-1: 22ce00bdbbb5813866dc6274434405f692d6fdcf SHA-256: 5b51cd7c564a0fe5bdfc49dde14760a21458cad6b345ef44f438fed47f8b6776
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector infrastructure, indicating a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=amazing+grace+lyrics+and+chords+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary goal is to redirect users to malicious sites.

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=amazing+grace+lyrics+and+chords+pdf
    • http://files.danceenvoy.com/uploads/1/3/2/7/132740871/c23d9645fc.pdf
    • http://files.shawnpurvis.com/uploads/1/3/1/4/131482988/dikike.pdf
    • http://files.smswanhill100years.com/uploads/1/3/1/4/131438071/329977.pdf
    • http://files.lwmphotography.co.uk/uploads/1/3/1/4/131410685/kukitifizija.pdf
    • http://files.grantjacobyanddancers.com/uploads/1/3/0/7/130740112/somepeboba_pexosekazojega_nunilabe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5576/7967/files/jisubexe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8887/files/niwixusumusejot.pdf
    • https://cdn.shopify.com/s/files/1/0439/5817/3854/files/papabugokabuloniboxevupig.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6133/files/50779118961.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xasojikunu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/1881436892.pdf
    • https://cdn.shopify.com/s/files/1/0431/5915/8946/files/introduction_to_math.pdf
    • https://cdn.shopify.com/s/files/1/0435/1783/7480/files/nuviriwuredatugemepe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/jixak.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/watch_iron_man_2_online_free.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_off000056d2.bin
fb1faa1dff97a0e4b82ac10c8013d33c47bf95c5d56695a58a2a2f98c6c7ddea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56D2 5708 bytes
font_01_sfnt_off00006a17.bin
b66d491bdbff371b1569d33d39359003b77813c54d2c082a5dbe14866458f82a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A17 2144 bytes
font_02_sfnt_off0000742f.bin
a7f27a7f7449f7f45cabc8f9e3c292371abfa79587839d582d0411ddb06d0476		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742F 10392 bytes

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