Malicious PDF — malware analysis report

Static analysis result for SHA-256 042500168a2b2892…

MALICIOUS

PDF

56.7 KB Created: 2020-07-20 19:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46a2a32802481ecade528f008080a6e7 SHA-1: 8c8c1b76b5e93ceaab2b06a9b4dd7455cf256aa0 SHA-256: 042500168a2b2892228af412d666eaff0aefa3ffaea9fec9e7dfa8e2b7f79f70
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, appears to reference a book title, suggesting a lure. The presence of many external PDF links, including one pointing to a malicious redirector, indicates an attempt to drive traffic to potentially harmful content, possibly for SEO spam or phishing.

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=why+do+we+sleep+book+pdf
    • http://files.javiwan.com/uploads/1/3/1/6/131607054/8487423.pdf
    • http://files.equityingenetics.com/uploads/1/3/0/8/130874265/tarise.pdf
    • http://files.arohabeautyhouse.com/uploads/1/3/2/6/132682610/purupigikavopeki.pdf
    • http://files.cestagift.com/uploads/1/3/1/1/131163601/tezuxijolamokub_bozolugadajaso.pdf
    • http://files.lakecookbehavioral.com/uploads/1/3/0/7/130739063/bafapixipemozej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8156/3298/files/lawukod.pdf
    • https://cdn.shopify.com/s/files/1/0433/4089/0262/files/vonelesojepakujat.pdf
    • https://cdn.shopify.com/s/files/1/0431/7980/2782/files/3500482808.pdf
    • https://mozovubebu.files.wordpress.com/2020/06/74969976498.pdf
    • https://nurabekowiv.files.wordpress.com/2020/07/jogise.pdf
    • https://tamiwawafota.files.wordpress.com/2020/06/76944240698.pdf
    • https://relidenosumo.files.wordpress.com/2020/07/14847579139.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/99937589850.pdf
    • https://cdn.shopify.com/s/files/1/0428/5258/1542/files/18149724571.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/guxat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/welilavuruwad.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/sezimakamiselivaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/90167113235.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/79844800132.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/mugemuwudarekagomadelire.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_off0000a0dd.bin
8d91b63444a87d7036200c9c21a1f4c881929f4e2f832f6e1787e691ab3ad331		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0DD 4788 bytes
font_01_sfnt_off0000b14d.bin
e5339e430f4b163baff373ee725b83574e81e15e1c009e8607ac168f978c89e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB14D 10544 bytes

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