Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc97ee989ced964d…

MALICIOUS

PDF

58.4 KB Created: 2020-07-26 17:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dce53ebe8aea566168ce3d0c5d06bbb7 SHA-1: 1f530cebc3b20311351724dc6d7400fcf037c14b SHA-256: cc97ee989ced964d4fe8652f69a53ded1857de21a955798b5d2f7070d6479fe1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm with numerous external PDF links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of 'Aztreonam prescribing information' and the wkhtmltopdf authoring application suggest a lure document.

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=aztreonam+prescribing+information
    • http://files.fionasenton.co.nz/uploads/1/3/0/7/130776743/1875164.pdf
    • http://files.jerodbogh.com/uploads/1/3/2/7/132740275/ditunafujemisevoru.pdf
    • http://files.evangelizeme.org/uploads/1/3/0/7/130738771/939072.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/sugikibunex.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/xudesibomitokofo.pdf
    • https://cdn.shopify.com/s/files/1/0436/8397/1237/files/kezumusobivakojid.pdf
    • https://cdn.shopify.com/s/files/1/0429/0173/3542/files/mimabirapefividomu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/91848083223.pdf
    • https://cdn.shopify.com/s/files/1/0431/2979/8818/files/zekizubowepusiwurivej.pdf
    • https://cdn.shopify.com/s/files/1/0435/4503/4911/files/15490129911.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/numikonizagamasutesa.pdf
    • https://cdn.shopify.com/s/files/1/0438/2644/6498/files/kivis.pdf
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/limuvanivupovirinof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/41015563248.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/15457982390.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/nawisejedova.pdf
    • https://cdn.shopify.com/s/files/1/0429/5609/5644/files/radujekobijarodoto.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/
    • https://cdn.shopify.com/s/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a300.bin
7c395a0e0959c60997c1fa2b895f0e5d96df444518a9a60767487239c0ff6c32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA300 5272 bytes
font_01_sfnt_off0000b4cd.bin
34ecc8487d6861f6d6d24a8c83e1eb1fedf0894f1bffe4736349a120a6e79d49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CD 12252 bytes

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