Malicious PDF — malware analysis report

Static analysis result for SHA-256 7161b41d6fa96f5a…

MALICIOUS

PDF

48.5 KB Created: 2020-08-04 00:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5039b902e3da224849df980f9a9debe3 SHA-1: fad8faa84d909de40c97beea32e14936dd853d79 SHA-256: 7161b41d6fa96f5a75bb36dbd6d322ce6a8e15bf6ddfe252e5fb4fab31007782
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=behavioral+design+patterns+pdf, suggesting a lure to a malicious site. The presence of many external PDF links indicates a link farm or redirection strategy.

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=behavioral+design+patterns+pdf
    • http://tezek.vetwoundlibrary.com/uploads/1/3/1/4/131454106/fulexekudipikot_miwelikedivi_losuwejisovopu_fofig.pdf
    • http://files.mashamsteamrally.com/uploads/1/3/1/4/131437750/vifigagugexafena.pdf
    • http://files.shelleyartwork.com/uploads/1/3/0/7/130776728/vapafilido.pdf
    • http://files.arcadecoffee2go.com/uploads/1/3/0/7/130740483/4292509.pdf
    • http://files.purpletigergonewild.com/uploads/1/3/0/7/130775429/1631509.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8113/8343/files/60343251022.pdf
    • https://cdn.shopify.com/s/files/1/0431/0401/0389/files/18118140337.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/52740670161.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4940/files/36955245604.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/20391736987.pdf
    • https://cdn.shopify.com/s/files/1/0435/5552/0667/files/24922276585.pdf
    • https://cdn.shopify.com/s/files/1/0431/0014/3777/files/biwenajara.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/gebixo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8135/files/digimon_world_digivolution_guide.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a04.bin
aa03a40c38df624abe74c1fbce6af49ba2b7ae2a5be272ef7789b3b4987629a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A04 5200 bytes
font_01_sfnt_off00007bb5.bin
33ec36cabc44c225485f973deda0a57fdd288baae1aa7fe60844d6568fcfe376		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB5 13824 bytes
font_02_sfnt_off0000a6d4.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D4 4324 bytes

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