Malicious PDF — malware analysis report

Static analysis result for SHA-256 22dc3821bf0919ca…

MALICIOUS

PDF

48.4 KB Created: 2020-08-03 18:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 189ee7f6fbc2d0cae88e47446e77de5f SHA-1: 2a52b96a4cb1d09bf114553fc1e7b2da6724d816 SHA-256: 22dc3821bf0919ca0468f96e52f74f4207e449083567f0cecee06df0dd7d4cb9
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to a malicious site under the guise of providing a PDF 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.com/pify?keyword=alternating+series+test+proof+pdf
    • http://files.bccbuilders.net/uploads/1/3/2/6/132681443/kigovevidor_nogejesubeve.pdf
    • http://files.theicelandproject.org/uploads/1/3/1/4/131407315/1970134.pdf
    • http://files.majorrevisionspodcast.com/uploads/1/3/1/6/131606968/6770664.pdf
    • http://files.bgshelterpets.com/uploads/1/3/1/6/131606789/3505414.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/48906099741.pdf
    • https://cdn.shopify.com/s/files/1/0439/2553/6936/files/john_deere_technical_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/5507/7790/files/4765618036.pdf
    • https://cdn.shopify.com/s/files/1/0427/8213/0332/files/26083408795.pdf
    • https://cdn.shopify.com/s/files/1/0434/5013/8784/files/twitter_api_keys.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xakisone.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/14382515392.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/mapidi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/mozelozomugavumafotoli.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5815/files/purandaradasa_songs_lyrics_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/zevudilotan.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/56593324145.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_off00006118.bin
67774531d5b2f18afadccb1ec38e9da2088a301727044dc9fdf4c43bf0aa1348		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6118 5200 bytes
font_01_sfnt_off000072db.bin
59c6d90f888822e1a646ea4fb771dea92b04cb5e0c8c2c20a816463250fa20af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DB 13960 bytes
font_02_sfnt_off00009faf.bin
1513cff1140ee46b119fd1f1a8d89226c35fa745519edd36504e398b791a408b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FAF 16084 bytes

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