Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f2e682fa88b99b…

MALICIOUS

PDF

40.3 KB Created: 2020-08-07 19:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1959f04af72bc37fb8fc30e46fccbffa SHA-1: 6cb8c125b67f9316f9e85a021d280be95fe4964d SHA-256: f0f2e682fa88b99ba287867ebc37f64c674f28e41943784ce7f2dc8d1372aafb
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains a URL that matches the malicious redirector. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the ultimate destination and potentially engage in SEO poisoning. No scripts were extracted, but the primary attack vector appears to be the redirection to malicious URLs.

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.com/pify?keyword=pannes+diagnostics+auto+pdf
    • http://files.sarahgray.info/uploads/1/3/0/7/130775309/wibozenan-vubur-rovojoxevis.pdf
    • http://files.justinpomerance.com/uploads/1/3/0/7/130739122/luxoforiko.pdf
    • http://files.sofiebal.com/uploads/1/3/1/0/131070294/cb805be8a062c29.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8969/files/lalapamavazipizipo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/vovekowi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/reriwidabiw.pdf
    • https://cdn.shopify.com/s/files/1/0437/9118/8117/files/voxodijotewaxaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/4216/8218/files/ballade_in_g_minor_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/2266/3331/files/99462701330.pdf
    • https://cdn.shopify.com/s/files/1/0447/9172/6240/files/echo_cs_310_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6250/files/effective_communication_in_the_workplace.pdf
    • https://cdn.shopify.com/s/files/1/0430/9712/9109/files/pelipazot.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/befid.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/35362843850.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7255/files/80721601380.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_off00004eb6.bin
afc152fd40d01673cc372ee2a2a900a00f0dae4fc3c716d796628580ace56afd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EB6 5080 bytes
font_01_sfnt_off00006011.bin
8de9809df50dc9f46146646f6e55e4750774df0b03f50fef08380bc072e699ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6011 11500 bytes
font_02_sfnt_off0000849e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x849E 4324 bytes

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