Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e52cedd833e2bf…

MALICIOUS

PDF

43.1 KB Created: 2020-08-04 01:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 089a3f645c4aad5dfdb23283f4cc9209 SHA-1: dddae9afca4b0ac9d097405b59f0a95b10fd7e92 SHA-256: 19e52cedd833e2bfd924937dbe8d069058d90eaf470d396a70de13bef7ecccf1
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to a known malicious redirector, ttraff.ru. The document body, though heavily obfuscated, contains text related to 'Sinusitis tratamiento antibiotico pdf' and includes numerous URLs, many hosted on Shopify, but also several on suspicious domains. The primary malicious URL is https://ttraff.ru/pify?keyword=sinusitis+tratamiento+antibiotico+pdf, which likely serves as a gateway to further malicious content. 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=sinusitis+tratamiento+antibiotico+pdf
    • http://gabum.coworksurf.com/uploads/1/3/1/6/131606069/834a0f220f3243d.pdf
    • http://files.ordubhchocolate.com/uploads/1/3/0/8/130873758/maniwo_bibom_livatefuju.pdf
    • http://files.farmandranchdogs.com/uploads/1/3/2/7/132712120/7164542.pdf
    • https://cdn.shopify.com/s/files/1/0429/3161/7945/files/76541980247.pdf
    • https://cdn.shopify.com/s/files/1/0433/1172/6750/files/32199098232.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/23452075104.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4773/files/zalesipukafi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1877/2903/files/gulimafurizixilip.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2672/files/53933435079.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3580/files/sejogelifowas.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/74066066748.pdf
    • https://cdn.shopify.com/s/files/1/0434/8297/2326/files/dotulonut.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/51295509820.pdf
    • https://cdn.shopify.com/s/files/1/0434/0108/5082/files/memenivo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84770620138.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/47867378189.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6295/files/frigidaire_self_cleaning_oven.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_off00005c9a.bin
0f6cdb27356f9f393d6bed580e1dae66f2bbd4b8ed7ecbb3003e6bd3ca6d1cff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9A 5396 bytes
font_01_sfnt_off00006ebd.bin
b2f300bc48dcc6412ad3b14e6131d859565a6bef00962f6b3147395176c6ed21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBD 10224 bytes
font_02_sfnt_off00009116.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9116 4324 bytes

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