Malicious PDF — malware analysis report

Static analysis result for SHA-256 4438ffb14026cae0…

MALICIOUS

PDF

42.4 KB Created: 2020-08-22 12:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12d8ee20ba85c562dbb01171318937e2 SHA-1: b1a9762787f18d16e0e6ea862fcc9e7a85f40e03 SHA-256: 4438ffb14026cae0d6908c19e68a08ef6b5f9baefb94b0c7192a17ebba4ce409
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the target URL and references Taekwondo forms, suggesting a lure to entice clicks. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to distribute the malicious content.

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=taekwondo+black+belt+forms+koryo
    • http://files.myrealfarm.net/uploads/1/3/0/7/130738814/d892d9ec3.pdf
    • http://tumovuge.blueheronstainedglass.net/uploads/1/3/1/4/131407355/b26da6f4.pdf
    • http://xexorenad.prestigeautobody.org/uploads/1/3/1/4/131452977/7720392.pdf
    • http://files.lalobascatering.com/uploads/1/3/1/6/131636954/kuberogikud.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/60886465394.pdf
    • https://cdn.shopify.com/s/files/1/0433/8332/4822/files/91712476473.pdf
    • https://cdn.shopify.com/s/files/1/0437/6641/5514/files/pufikizinusogovatekuvexug.pdf
    • https://cdn.shopify.com/s/files/1/0428/5366/2883/files/66051946023.pdf
    • https://cdn.shopify.com/s/files/1/0433/7441/1926/files/jipamudus.pdf
    • https://cdn.shopify.com/s/files/1/0432/0742/6216/files/30810126605.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/minutarotezopififedove.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/cashless_economy_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/0699/9203/files/doppler_de_arteria_cerebral_media.pdf
    • https://cdn.shopify.com/s/files/1/0429/8211/3433/files/sijewezekutogegukepuro.pdf
    • https://cdn.shopify.com/s/files/1/0429/1015/4908/files/besame_mucho_string_quartet_sheet_music_free.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_off00005a9d.bin
dc83b20f697d0c6e1e2105ac73764e94cd4910de43e5b8f38c7641b9f8bb46e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9D 5252 bytes
font_01_sfnt_off00006c7d.bin
43e82329d40f9bf901d33c1abf2839cfec1e724e81688fa3ee58e1d453519e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7D 9988 bytes
font_02_sfnt_off00008ead.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAD 4324 bytes

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