Malicious PDF — malware analysis report

Static analysis result for SHA-256 952e538c42ba71a1…

MALICIOUS

PDF

72.9 KB Created: 2020-08-11 20:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6e3c85c18c61c7b6db14bf51c8ef982 SHA-1: 65d4a188b50423cf9182a4598f28d7add452a38d SHA-256: 952e538c42ba71a1ec9a1d8f54d331b759b446975bd0391910a0d2d104dc818b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure at 'ttraff.cc'. This indicates a link farm or redirection tactic designed to obscure the final malicious destination. The document body, though heavily obfuscated, contains the string 'https://ttraff.cc/pify?keyword=unix+shell+tutorial+pdf', confirming the malicious redirector. The primary intent appears to be directing users to potentially harmful content or further stages of an attack.

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.cc/pify?keyword=unix+shell+tutorial+pdf
    • http://files.prssasacstate.com/uploads/1/3/1/6/131607522/9474275.pdf
    • http://files.nrichardson.com/uploads/1/3/1/4/131408432/3f427d1ab4.pdf
    • http://files.wilkinsoncounselingatlanta.com/uploads/1/3/1/8/131856852/kupodukowut.pdf
    • http://gemedo.erickacollado.com/uploads/1/3/2/3/132303072/xunuzulajuti-logupawepali-ruridasuvojezat-gufakupodepek.pdf
    • http://files.hkcofc.com/uploads/1/3/2/6/132683111/lobojevaresale_jojolurirukekof_nunaduwarutare_rulilik.pdf
    • https://cdn.shopify.com/s/files/1/0431/0243/7527/files/nisivurujevusigan.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/lidexifedofisojosa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/madafob.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9287/files/redawokejavugogaja.pdf
    • https://cdn.shopify.com/s/files/1/0431/2324/5216/files/brujeria_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0437/3640/0037/files/59540965345.pdf
    • https://cdn.shopify.com/s/files/1/0431/5987/9841/files/45976316029.pdf
    • https://cdn.shopify.com/s/files/1/0437/2496/3990/files/hallelujah_sheet_music_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5804/files/40967644683.pdf
    • https://cdn.shopify.com/s/files/1/0444/6945/2967/files/boy_scout_first_aid_kits.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0b1.bin
12eab453d7ad7783848951824a8dffe0feffe4dfffdcfa4a621c9ad7b5e765ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B1 5072 bytes
font_01_sfnt_off0000e1e9.bin
d720919674b3846d5e93c691be183619c70382ddb5905f74e32c8f239a22894d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 11604 bytes
font_02_sfnt_off0001085f.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 4324 bytes

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