Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f633de7f1f8aeb9…

MALICIOUS

PDF

49.7 KB Created: 2020-08-09 06:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d122bcfa365585a51528a1b360d281f SHA-1: b1ce7e6bd0b9cf8ea5cf9b690da6327a0215b6d3 SHA-256: 9f633de7f1f8aeb932295b85377f82db9a73a59957b333f543c7e593490ce266
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic firings indicate the PDF is designed as a link farm, likely to distribute malware or phish users. The primary malicious URL identified is https://ttraff.com/pify?keyword=absceso+periapical+con+fistula+pdf, which is used to redirect to other PDF files hosted on various domains. No scripts were extracted from this sample.

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=absceso+periapical+con+fistula+pdf
    • http://files.neworleansartreview.org/uploads/1/3/1/3/131378897/wapamaz_bebufuwesa_fexapil.pdf
    • http://files.minnesotadivingacademy.com/uploads/1/3/1/3/131383586/9280685.pdf
    • http://files.b-art-b.com/uploads/1/3/0/8/130873851/dedapu.pdf
    • http://files.nmffa.org/uploads/1/3/0/9/130969819/deniz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5580/0732/files/77869280257.pdf
    • https://cdn.shopify.com/s/files/1/0436/3363/9584/files/54378623300.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/62429268445.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/penepi.pdf
    • https://cdn.shopify.com/s/files/1/0436/8000/6294/files/xudapagapunakof.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2297/files/jiniruturafas.pdf
    • https://cdn.shopify.com/s/files/1/0430/0875/3827/files/pibawo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/12321535700.pdf
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/30786388761.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/mario_party_8_rom.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5465/files/aapc_practice_exam.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/lujepasaguxaxalejilegojuv.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_off0000755b.bin
c011f89902d6bc5697e9092180ec5344d71244509941d0984a7e29defe29f2bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755B 5160 bytes
font_01_sfnt_off000086df.bin
af3c8fc8564bbc5d1eea04614053d735ca50a0a635732a482f36c519cbe12c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86DF 10868 bytes
font_02_sfnt_off0000abb5.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABB5 4324 bytes

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