Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9311887439f720e…

MALICIOUS

PDF

113.4 KB Created: 2020-08-22 08:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8d846e87182bebe958aba2431c3725b SHA-1: bce661881cf6b52df3db52e39f410e90e10441b3 SHA-256: f9311887439f720e3a50646aafdb4a481792f6e029133594a5a1428ed656994f
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific redirector URL that is known to be malicious. The document body, though heavily obfuscated, contains text that suggests it is a worksheet, likely intended to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=pbs+cracking+the+code+of+life+worksheet
    • http://napaluje.sieglindemcgee.com/uploads/1/3/1/4/131407836/teteworazebinu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/fitoboturobosujegokilafek.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/55960137647.pdf
    • https://cdn.shopify.com/s/files/1/0433/3876/0342/files/tasovatutidun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/88075317933.pdf
    • https://cdn.shopify.com/s/files/1/0434/7373/1741/files/kindle_paperwhite_3_review.pdf
    • https://cdn.shopify.com/s/files/1/0437/7985/0398/files/noaa_aviation_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/denekasulotexataruxinen.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/14874094742.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9959/files/db_super_episode_75.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_off000180f8.bin
59f05412c02fb6d79cd925504c4ef112c8eafbca202086feb1a42ddc74aed4a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x180F8 5580 bytes
font_01_sfnt_off000193fb.bin
b92723a59c6e2421d251e8c1cdc37a3505ea4a7fd9651bf19e4d464f40501d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x193FB 10716 bytes

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