Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57848cdf4bcf065…

MALICIOUS

PDF

37.4 KB Created: 2020-08-03 00:39:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e960d182eee401f1ab82c9989e1af087 SHA-1: e07aeb8a01bd7b9a2619f4c89e0120734b8a2711 SHA-256: a57848cdf4bcf065026b1b4c79c9aa1be91c03e67094d0fabe564b16f4f1de23
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.com). The document body, though heavily obfuscated, contains text related to a technical manual and the malicious URL, suggesting a lure for users interested in such content. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious infrastructure via embedded links.

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=rocket+propulsion+elements+7th+edition+solution+manual
    • http://files.yourfootheadquarters.com/uploads/1/3/2/7/132712322/putijurulagufoz.pdf
    • http://files.stgeorgestbishoyvisalia.com/uploads/1/3/1/3/131381693/fab6750468984a4.pdf
    • http://files.worldnear.com/uploads/1/3/1/4/131406337/0b09f6710b40.pdf
    • http://bupuzux.masqdesign.com/uploads/1/3/0/8/130874197/984799.pdf
    • https://cdn.shopify.com/s/files/1/0436/0188/7396/files/jupyter_reload_module.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/fufomalugozovadefe.pdf
    • https://cdn.shopify.com/s/files/1/0440/6483/3686/files/86805057926.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/zigibe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72163988246.pdf
    • https://cdn.shopify.com/s/files/1/0433/5091/7269/files/96129988327.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/9339226388.pdf
    • https://cdn.shopify.com/s/files/1/0430/9804/6621/files/xifomeduzubu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/fairy_fighting_pokemon.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/80358147352.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/jisuvamagisinara.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/16345408739.pdf
    • https://cdn.shopify.com/s/files/1/0430/1524/1891/files/16036330478.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/texuve.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_off0000540e.bin
85eec53a9e99eebc043444cd40459317b3be7acddb04d6f53504d938d9126409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x540E 5464 bytes
font_01_sfnt_off00006683.bin
bfc433ca4bf0ee328c442ba49316822108fa60bb960ad1a3bf441535d5ab3810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6683 9876 bytes

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