Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9997181ffd3bbc…

MALICIOUS

PDF

51.0 KB Created: 2020-08-08 00:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d61fdec0380dcdfaa21d43218b9b7870 SHA-1: e84a04514aff9b3685cc8e3b28ba21a35a516030 SHA-256: 4e9997181ffd3bbc94b28775dc55f521bb75e48bb726428b7cb8ecd87752ecf5
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=the+practice+absite+question+book+pdf'. Another critical heuristic indicates a PDF link farm, suggesting an attempt to distribute or mask malicious content through numerous external links. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and URLs that mimic book titles, likely to deceive users into clicking malicious links.

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.ru/pify?keyword=the+practice+absite+question+book+pdf
    • http://lotasejek.faststartnutrition.com/uploads/1/3/2/6/132682076/8786399.pdf
    • http://files.kneadedsolacemassage.com/uploads/1/3/1/4/131410090/cec132afeb53c.pdf
    • http://files.roryfitzgeraldbledsoe.com/uploads/1/3/1/0/131070113/sajirezolisuwagekesa.pdf
    • http://files.ritaparadisfineart.com/uploads/1/3/1/3/131383664/gevajopekavi.pdf
    • http://files.kneadedsolace
    • https://cdn.shopify.com/s/files/1/0429/9823/5289/files/pathfinder_inner_sea_combat.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/career_paths_medical_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/14336743671.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/rizepepefekiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/65511028556.pdf
    • https://cdn.shopify.com/s/files/1/0440/0916/0862/files/90897995606.pdf
    • https://cdn.shopify.com/s/files/1/0437/1342/9655/files/34301942090.pdf
    • https://cdn.shopify.com/s/files/1/0429/0484/6503/files/36922347974.pdf
    • https://cdn.shopify.com/s/files/1/0428/0074/2567/files/dibisowa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5258/9465/files/23457048412.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/68312096877.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_off000079e1.bin
995cb550b65825f5bf83e7c16d8580aaebf0daa5940b60c3d14b9f11027f17d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E1 5372 bytes
font_01_sfnt_off00008c0c.bin
241362a0149e5f491fb04d7915eb098044fe6b4806317712f344dc1b7814bdd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0C 10664 bytes
font_02_sfnt_off0000b06d.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB06D 4324 bytes

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