Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fca230171a9127…

MALICIOUS

PDF

36.5 KB Created: 2020-08-28 00:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6a55399d904e47df82c698cd84f9496 SHA-1: 504f2e16ab281123dcca287ca8e138fd94b3db1d SHA-256: 05fca230171a9127c68bd95f73b1a4202d841897dea0c8576ac95b63d4a3a4cc
162 Risk Score

Malware Insights

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

The PDF contains a link to a redirector that is flagged as malicious, likely serving as a lure for cracked software. The document body, though heavily obfuscated, contains text related to 'gcpro key full cracked 100 working' and a URL that points to a redirector. The presence of numerous Shopify links, some benign and some unknown, suggests an attempt to obscure the malicious destination. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=gcpro+key+full+cracked+100+working
    • http://rajiket.alakaiheritage.org/uploads/1/3/0/8/130814238/9939015.pdf
    • http://bonujebut.sarahelizart.com/uploads/1/3/1/4/131453252/3e090606d48.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/9279/3757/files/mri_anatomy_of_brain.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/guvifokigeputufaf.pdf
    • https://cdn.shopify.com/s/files/1/0456/9815/4652/files/26876419596.pdf
    • https://cdn.shopify.com/s/files/1/0440/3170/5238/files/61935051389.pdf
    • https://cdn.shopify.com/s/files/1/0436/7722/1017/files/pokeru.pdf
    • https://cdn.shopify.com/s/files/1/0432/5595/5613/files/31090139007.pdf
    • https://cdn.shopify.com/s/files/1/0432/7247/0686/files/bimow.pdf
    • https://cdn.shopify.com/s/files/1/0436/6080/4249/files/renutov.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2545/files/64281500082.pdf
    • https://cdn.shopify.com/s/files/1/0431/5935/5556/files/57841457033.pdf
    • https://cdn.shopify.com/s/files/1/0440/2115/3957/files/dugevutusevunesusufopitir.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_off00004218.bin
fe321636c3a73ffbafcbbd1098611fd37ced3c3a2f511be207f0c1052333a25a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4218 5428 bytes
font_01_sfnt_off000054c0.bin
6308d4fce2993a1d2a655534ce55a7bc1f5f43baafc8722e44f5a0e62412caff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54C0 10152 bytes
font_02_sfnt_off0000776f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x776F 4324 bytes

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