Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cf1fe052cd0d0f…

MALICIOUS

PDF

34.8 KB Created: 2020-08-11 16:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46285eef7e0969b6e62e8627ef1fdbe9 SHA-1: ec3a184898eae93b196ff6825dfb7f59cf038841 SHA-256: 77cf1fe052cd0d0f22e6e029b54943e9c213dc2e0d60c0bbf0f0b9b671ce6c87
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure to download further content, likely a payload. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=alan+walker+faded+lyrics+pdf
    • http://files.chuanfaacademy.com/uploads/1/3/1/0/131070723/zumatajejuxelemutap.pdf
    • http://files.fitkidtext.com/uploads/1/3/1/1/131164009/vonijalijenen_fatesob_ketixu.pdf
    • http://files.otterworksusa.com/uploads/1/3/1/4/131437351/tasegus-rekafi-zeganusisaj-jigavulef.pdf
    • http://wudopove.reinwatchphotos.com/uploads/1/3/2/8/132814930/3699396.pdf
    • http://bidesabi.padisciples.net/uploads/1/3/0/7/130775219/d5a2de30.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/suniparijojivosina.pdf
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/jatijezavusosoxazolere.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5144/files/guvolupirolerijixo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/barry_seal_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/dr_brian_weiss_only_love_is_real.pdf
    • https://cdn.shopify.com/s/files/1/0441/3331/8808/files/76003877536.pdf
    • https://cdn.shopify.com/s/files/1/0433/6143/5813/files/60345568470.pdf
    • https://cdn.shopify.com/s/files/1/0436/4432/1945/files/gimp_2._8._22_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/210599405.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/nfpa_1031.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/luwutuxuna.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/componentes_de_la_personalidad_temperamento_y_caracter.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_off00004774.bin
3f1d32278b105e59f6cd24cff79fa94f6d6c08a14ae374d0fdde97ae6d9e3c64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4774 5396 bytes
font_01_sfnt_off000059f3.bin
c39b13d9ac3647713ce12711400cadeb15bc160515285364982f66b744619f44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59F3 10844 bytes

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