Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a35cee978e46d9…

MALICIOUS

PDF

46.0 KB Created: 2020-08-12 07:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e300508cf53835c6d3044e5e1f4fdd92 SHA-1: e50092fdec58c48cc739f46193f17a213cdbd291 SHA-256: 44a35cee978e46d9da7bbd49fdeab1e35e3738373b89a9d0cfcc5742432acf47
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=exodus+bible+quiz+questions+and+answers+pdf'. This URL is embedded within the document body, disguised as a benign quiz. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious. 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.cc/pify?keyword=exodus+bible+quiz+questions+and+answers+pdf
    • http://files.margaretgracie.com/uploads/1/3/1/4/131483281/rabebuzedunos-zoxukunu.pdf
    • http://files.crit.cloud/uploads/1/3/0/8/130874284/wezupasizujuta.pdf
    • http://files.vsbc-news.com/uploads/1/3/0/8/130814065/1987896.pdf
    • http://files.allinclusivetennis.com/uploads/1/3/1/8/131871687/nitadoxatolal.pdf
    • http://files.lodgewellnesscenter.com/uploads/1/3/1/6/131637631/wideranenalapof.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/25843379850.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6250/files/lesson_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0437/8296/3361/files/96815417647.pdf
    • https://cdn.shopify.com/s/files/1/0433/7618/1400/files/67189589111.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/6434236562.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2708/files/40704800764.pdf
    • https://cdn.shopify.com/s/files/1/0438/2670/8640/files/agriculture_afrique.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tefabojukiva.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/kumubixugiwilidokuru.pdf
    • https://cdn.shopify.com/s/files/1/0436/6077/1481/files/5205220768.pdf
    • https://cdn.shopify.com/s/files/1/0448/2557/5581/files/marketing_research_tools_and_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/goluwolapimemelife.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/72906990607.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_off00005ff8.bin
1b7eee5de54cb11ff7a4801780b61180befa4c81a177422999470216ef4fe500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF8 5348 bytes
font_01_sfnt_off00007247.bin
a1bd5d784b810d6a685a5c2578488de49b76eca5c94c8b1024fe131d72afad51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7247 13312 bytes
font_02_sfnt_off00009c74.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C74 4324 bytes

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