Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36b43eae3bccd88…

MALICIOUS

PDF

47.6 KB Created: 2020-08-30 04:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa9dfc08478412bfa4c27f08980da5eb SHA-1: 58f338be9d40789d2303e1d44305cf258965ca7c SHA-256: c36b43eae3bccd887828d51122f6113e9c606b15596db80bf5c386fbc1541776
152 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 'https://ttraff.link/wix?keyword=true+blood+season+1+episode+1+recap'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and a benign-looking PDF filename, suggesting a lure to disguise the malicious intent.

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.link/wix?keyword=true+blood+season+1+episode+1+recap
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/booty_band_workouts.pdf
    • https://cdn.shopify.com/s/files/1/0462/4272/6042/files/26522706204.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36149341097.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/88482310881.pdf
    • https://cdn.shopify.com/s/files/1/0434/5584/0409/files/jarapewalovilubadoke.pdf
    • https://cdn.shopify.com/s/files/1/0443/5968/0156/files/bengal_tiger_tamil_dubbed_hd_movie.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/76854921731.pdf
    • https://cdn.shopify.com/s/files/1/0433/3551/6318/files/3d_airplane_simulator_games_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/5534/1977/files/21418351882.pdf
    • https://cdn.shopify.com/s/files/1/0434/3873/5517/files/stata_string_to_numeric.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6902/files/russianhits_64_radio_logo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9508/files/vasculitis_poliarteritis_nodosa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riginijulu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5383/2609/files/64836068392.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/64315543021.pdf
    • https://cdn.shopify.com/s/files/1/0437/2204/7638/files/telugu_movies_songs_2018_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zaduvezumutup.pdf
    • https://cdn.shopify.com/s/files/1/0431/9100/9442/files/tisafumejogofeboze.pdf
    • https://cdn.shopify.com/s/files/1/0432/4435/5739/files/3006188330.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_off00007c48.bin
8c5ac955ba7276c78214806cb550b5f25acd2e86e25537586621e987e4f2a1b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C48 5208 bytes
font_01_sfnt_off00008e01.bin
234ea50f986f5fb19c8067f3719bb98f63cc2e80538dca0d7a87a4d93f1031b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E01 10344 bytes

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