Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d58f07cf9e1b7cf…

MALICIOUS

PDF

50.6 KB Created: 2020-08-05 03:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29cd03554c257695345d4a0b82ba5c9a SHA-1: 4cb60fb552ad9b6579691ca37c4d31ae79ea7dcf SHA-256: 7d58f07cf9e1b7cf1f0f0c4cfc35c6ffdc980c0307722b26326e8871bd92f0aa
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 of which point to a link farm hosted on cdn.shopify.com, and one critical link directs to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains references to the redirector URL and other URLs that likely serve as lures. This indicates a phishing or redirection attack designed to lead the user to 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.ru/pify?keyword=spirulina+bioreactor+pdf
    • http://files.gabrielledeveaux.com/uploads/1/3/2/7/132740399/dasegewerugebi.pdf
    • http://files.computerscpr.com/uploads/1/3/2/7/132740860/xubujolodosetejokuv.pdf
    • http://mufim.resumeswithrashada.com/uploads/1/3/0/8/130874254/665030d6f0f1d22.pdf
    • http://files.mj2startups.com/uploads/1/3/1/3/131379236/2813915.pdf
    • http://files.crookedarrowpress.com/uploads/1/3/0/7/130775825/venutekota.pdf
    • https://cdn.shopify.com/s/files/1/0430/0986/7929/files/vamuxis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20011772627.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/rafoliwufobapurawuvezamaj.pdf
    • https://cdn.shopify.com/s/files/1/0441/0041/9736/files/83475424921.pdf
    • https://cdn.shopify.com/s/files/1/0433/0831/8878/files/54471082606.pdf
    • https://cdn.shopify.com/s/files/1/0429/8876/5337/files/active_and_passive_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/90884464167.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7831/files/25439014513.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/bisage.pdf
    • https://cdn.shopify.com/s/files/1/0433/5878/1590/files/pokemaguburavuxuba.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9447/files/32842218798.pdf
    • https://cdn.shopify.com/s/files/1/0437/2434/1400/files/telotexe.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_off00007b9a.bin
2a28c7a0de5d4d8cf6a8cbb1f0af6be1f9054910859e01ff416d525362ec35c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9A 5096 bytes
font_01_sfnt_off00008ce8.bin
90a3df78cc8c793375bce403eba1da1e22f2fc554fe914763cf9110bfdd2474f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE8 10108 bytes
font_02_sfnt_off0000af88.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF88 4324 bytes

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