Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5919d5bcbc4bb2b…

MALICIOUS

PDF

32.5 KB Created: 2020-09-17 01:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23463479f007089d1957f6efaa8a9e3e SHA-1: 6aa20e2835a51a65e14e7e88b204bad05beb4233 SHA-256: f5919d5bcbc4bb2b37408949641ea14b3abfce0683d5cb111e00306a4aa8d2da
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found by the heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via these links.

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.me/wix?keyword=sichuan+pavilion+dc+delivery
    • http://guwom.teachingconnections.net/uploads/1/3/0/7/130775565/890032644b3e291.pdf
    • http://fovor.miyakostudio.com/uploads/1/3/0/8/130813747/kozuveluzi-xosodezitex.pdf
    • http://vujalenu.alabamacricket.com/uploads/1/3/1/4/131409090/zogumejawujizaw_pujafepo.pdf
    • http://files.reachwaupun.org/uploads/1/3/1/4/131454521/lejefuwavesaxobexu.pdf
    • http://files.abc-tokyo.com/uploads/1/3/1/4/131438077/8555758.pdf
    • http://files.lifecoachkoreen.com/uploads/1/3/1/3/131384211/wibofelib.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/31113512374.pdf
    • https://cdn.shopify.com/s/files/1/0428/0179/1132/files/assumptions_of_cardinal_utility_approach.pdf
    • https://70c3ffc2-0a67-44a5-91e5-995d80d0623c.filesusr.com/ugd/90423f_76cb30052e6d4f6882beff6af166c1b7.pdf?index=true
    • https://5aae84bc-a43f-4e7a-af4b-3c0936e0d569.filesusr.com/ugd/26481d_b595d4953e1c4ed59b02ad17aa8a1e31.pdf?index=true
    • 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_off00004117.bin
cafb9be471e4f3ea9ddcb1c228b613ac8f34ccf503e8f7fc66f21c6e5e19cb77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4117 5248 bytes
font_01_sfnt_off000052f9.bin
502c863f19df5b7c762a7778c7d50bdbc8e7a0f4512473681194be6b45ec3778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52F9 10136 bytes

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