Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a4fb2b2f9eed76…

MALICIOUS

PDF

56.4 KB Created: 2020-08-24 03:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3dbabca51293ec7cbf833924e7fae667 SHA-1: fb916b5354ea1c559094f84cec43da442d407d72 SHA-256: 64a4fb2b2f9eed76e9b2e85da37959a68944c64e3dfc990b7505146ebda12d0a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, https://ttraff.ru/pify?keyword=python+format+list+of+dictionaries, is presented within the document body, likely as a lure. The document also functions as a link farm, directing users to 24 other PDF files, some of which are hosted on Shopify. The ML classifier strongly indicates maliciousness.

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=python+format+list+of+dictionaries
    • http://files.lordofdwarves.com/uploads/1/3/1/3/131379396/wurago-datogepivig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/9491/5738/files/30006240300.pdf
    • https://cdn.shopify.com/s/files/1/0460/1620/0863/files/shatta_wale_2019_songs.pdf
    • https://cdn.shopify.com/s/files/1/0440/0313/1542/files/42500625907.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/98046024876.pdf
    • https://cdn.shopify.com/s/files/1/0436/0034/7299/files/47901962044.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/piredunizozetojulifa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2227/7032/files/55843988147.pdf
    • https://cdn.shopify.com/s/files/1/0447/9103/8118/files/sonda_vesical_demora.pdf
    • https://cdn.shopify.com/s/files/1/0438/5924/7264/files/luxid.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/45012737216.pdf
    • https://cdn.shopify.com/s/files/1/0434/0337/8839/files/39977475660.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fa2.bin
8f26d7e9ccf1724911ba3f3debd4dda912b548c75a2dcfd1b56392d6575a4819		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA2 5152 bytes
font_01_sfnt_off000080e9.bin
dc529db13dcb448bda1a82b661aaab3b4cd4fe915e28519853358555f8f14f93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80E9 14232 bytes
font_02_sfnt_off0000addc.bin
e37c443e4422a9e953eb8fcd11dfa6360565e839dee4ffaa628fb8838c35acb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADDC 16620 bytes
font_03_sfnt_off0000c47d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC47D 4324 bytes

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