Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6d84f607ff04b5…

MALICIOUS

PDF

41.0 KB Created: 2020-08-26 20:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d91ebdd49ddec3ebb940bb605aa5755 SHA-1: 1363bc4103cbf08530655d55d00504fe5cd64bf1 SHA-256: 2e6d84f607ff04b5afc4f1b2f0b64e4dcc518261f2c1e8511e3bb17240942f6a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, including a redirector. This suggests a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL further supports this. No scripts were extracted, so the exact payload delivery mechanism beyond linking is unclear.

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.club/pify?keyword=the+it+crowd+online+subtitulado+vimeo
    • http://files.seashells-nursery.org/uploads/1/3/2/8/132814342/pedumova.pdf
    • http://kiwesik.fingerpoppinsoul.amsterdam/uploads/1/3/1/4/131407552/5399077.pdf
    • http://files.obop.org.nz/uploads/1/3/1/3/131383664/larakuti.pdf
    • http://files.debbiesangelsproductions.com/uploads/1/3/0/7/130740193/xetonufisexusedaxas.pdf
    • https://cdn.shopify.com/s/files/1/0464/6322/1912/files/wpf_hierarchicaldatatemplate_contextmenu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/porekox.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4474/files/channels_tv_app_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/9696/5269/files/vedudulawax.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/55638956522.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/dbz_legendary_super_warriors.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/insider_travel_guides.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/food_day_sign_up_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0515/files/b._sc_organic_chemistry_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.pdf
    • https://cdn.shopify.com/s/files/1/0435/3540/1111/files/antonin_artaud_francais.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/mulixamaziwofazosodutaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/2507/2282/files/18692769955.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006169.bin
cc82d57cf03e611905199a1872a495b178ed0991ef0f6d1ef761750a6541782a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6169 5420 bytes
font_01_sfnt_off000073bb.bin
f1f870b6059cd24f1a61b894ef0f3940bd114e35cc43f7d2336fea4de149f081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73BB 10352 bytes

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