Malicious PDF — malware analysis report

Static analysis result for SHA-256 d075726a3fb3a60d…

MALICIOUS

PDF

48.4 KB Created: 2020-08-14 14:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e89fbf25767ac6d41222027a6cc91e84 SHA-1: 287ce3e099a380628cad8dd884b4ccc0156ef4cf SHA-256: d075726a3fb3a60d9ecc6b9a1ca37f3e3d144955c68de20a22344346b25b408f
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wb?keyword=approximation%20by%20superpositions%20of%20a%20sigmoidal%20function%20pdf'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding a large number of external links, many of which point to Shopify domains. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering through deceptive links within the 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.ru/wb?keyword=approximation%20by%20superpositions%20of%20a%20sigmoidal%20function%20pdf
    • http://files.torbayvts.com/uploads/1/3/2/6/132695280/3878687.pdf
    • http://files.cambria-bailey.com/uploads/1/3/1/4/131437680/3920212.pdf
    • http://saxuvire.jetbossphotos.com/uploads/1/3/0/7/130739564/judelaxesi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90841244024.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zadolodiwifunum.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/mathematical_physics_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4993/files/5470277938.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/sezavu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9550/6592/files/waxaraw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0425/5656/files/purilefaratukegig.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/86780953473.pdf
    • https://cdn.shopify.com/s/files/1/0432/7302/7749/files/25323110792.pdf
    • https://cdn.shopify.com/s/files/1/0435/2222/8379/files/tadimofanenomovuso.pdf
    • https://cdn.shopify.com/s/files/1/0431/2340/9057/files/libobidefan.pdf
    • https://cdn.shopify.com/s/files/1/0436/1977/8720/files/2855515565.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0134/files/vipexopifosakerijigotitit.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/22950977518.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_off0000637d.bin
c21fac523e390260b091504b2148aa918f1598b97918b06e8baee21bb691f17b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x637D 5772 bytes
font_01_sfnt_off0000770b.bin
fd53dcf521aeda19b175a1b3ddbd016131b472a3e62af0eeb5c0b85dec011828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770B 11240 bytes
font_02_sfnt_off00009dbe.bin
cc7ec360ccbc48638c6d22781c35c6d378614e71199201dbde580dc0a305c4e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DBE 16364 bytes

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