Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e845e0464fefd04…

MALICIOUS

PDF

48.4 KB Created: 2020-07-24 17:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1de02e7551a42a8cd83e56cc0a259455 SHA-1: 6e07815f15df2e3cb202d45f456a8b9bd96ace59 SHA-256: 4e845e0464fefd04db2208171918c43de7bba85acfdfb89c889564dabb239ed6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one to 'cdn.shopify.com'. The document body, though heavily obfuscated, contains metadata suggesting it's related to reviews, likely a lure to encourage clicking the malicious link. 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/wb?keyword=emerald%20manual%20and%20digital%20air%20fryer%20reviews
    • http://files.everlastinglovechurch.org/uploads/1/3/0/7/130775402/34e8551d.pdf
    • http://files.johngowdy.com/uploads/1/3/1/6/131606373/5508110.pdf
    • http://files.agefriendlyteaneck.org/uploads/1/3/0/8/130874278/2e02f4.pdf
    • http://files.syncrobiz.net/uploads/1/3/0/7/130775665/pibemogi.pdf
    • http://files.workfocusedimprovement.com/uploads/1/3/0/8/130874102/legipokubodazeg-debewatavuvar-wejafonegi-fawopolare.pdf
    • http://files.syncrobiz.net/uploads/1/3/0/7/130775665/pibemogi.p
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/kafoti.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/28488281669.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/29217568582.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8584587797.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/puduzala.pdf
    • https://cdn.shopify.com/s/files/1/0438/1887/7085/files/timuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/wusipilarixolodosagexu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2973/2248/files/kidisutepowofijiwotitowib.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/18865063705.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9645/files/sewavovilodexanatewudofu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13336488851.pdf
    • https://cdn.shopify.com/s/files/1/0431/2599/7722/files/9727181089.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008076.bin
6060c5f91b6714d3374724269e92e5c78c49a1f9017aebaf779cbac3e19cdab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8076 5208 bytes
font_01_sfnt_off0000921e.bin
fcb450c2bc0d4ecb6a0f774cf68ee15d0e29422d3f69b823f95451e605ee76b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x921E 9984 bytes

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