Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2ddfa36a62f623…

MALICIOUS

PDF

42.5 KB Created: 2020-08-06 07:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84aa335283cd1a8dd506d3859f6682d0 SHA-1: 9332132a8484667872b1683466d2747f73a218ba SHA-256: 5d2ddfa36a62f62373a3d0ee057d06752a8178fbd5dddb7924298350b7a46af8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a link farm or phishing attempt. The document body text and embedded links mimic search results for an anatomy atlas, likely to trick users into clicking malicious URLs. The ML classifier also strongly indicated maliciousness.

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=telecharger+atlas+anatomie+humaine+pdf
    • http://kalagu.4windsmedicine.com/uploads/1/3/2/6/132682646/f712a868ae1.pdf
    • http://files.nscasa.org/uploads/1/3/1/6/131606175/1e8a3f.pdf
    • http://files.nuggetfest.com/uploads/1/3/0/7/130776104/pupilosudo_ruxaxajoziluguk_wutenojak_pulofisonilure.pdf
    • http://files.phisterequipment.com/uploads/1/3/1/8/131871477/19448ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0133/1360/files/alif_novel_episode_5_download.pdf
    • https://cdn.shopify.com/s/files/1/0447/8559/8615/files/bipolare_strung_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/51465978612.pdf
    • https://cdn.shopify.com/s/files/1/0433/9017/3349/files/sifomerimijozem.pdf
    • https://cdn.shopify.com/s/files/1/0435/3789/1477/files/80889012176.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/dubipumegalusenedepukoki.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4099/files/wojidilubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/52527030488.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/97792226882.pdf
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/sezuvolupuzijewagebu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0786/8060/files/75813369007.pdf
    • https://cdn.shopify.com/s/files/1/0428/4229/2391/files/60215620178.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/54910679891.pdf
    • https://cdn.shopify.com/s/files/1/0437/9587/3949/files/rolling_stones_top_500_albums_list.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006220.bin
d7dd5bcd5f9f57dfcb39e08f447fca8b8121a773dc100b3c15bf55b5ab14df2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6220 5516 bytes
font_01_sfnt_off000074b7.bin
32519ba1db3600a38899a63bcf4c69b2ec9f9b1deac4d67e4508cf7386645942		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B7 11952 bytes

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