Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b1e0baefb46554…

MALICIOUS

PDF

44.6 KB Created: 2020-08-11 14:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 584a40f89652b3afe40c63db6f98e1d9 SHA-1: fc8a532a78fa0d5ce2fea3b5f392b4e65f7bb9fe SHA-256: 19b1e0baefb46554ea0956506ddde39065c954c8001e7a655d0297afeb5c3426
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to potentially malicious redirector infrastructure like 'ttraff.ru'. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to manipulate search engine results or lure users to malicious sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=amazing+grace+pdf+sheet
    • http://xozogupon.hayounlee.org/uploads/1/3/1/1/131163635/6cc97.pdf
    • http://gafapari.aerialdancemarin.com/uploads/1/3/0/7/130775436/zanujajo.pdf
    • http://files.mtslma.com/uploads/1/3/1/1/131164383/4230151.pdf
    • http://files.jovancasmith.com/uploads/1/3/1/4/131406082/gadiwak_rodipib_netunaf_bolej.pdf
    • http://files.sems4acultureoflife.org/uploads/1/3/0/9/130969984/feregad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/67688192245.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7174/files/zijeketamil.pdf
    • https://cdn.shopify.com/s/files/1/0429/3722/1276/files/silekejubawofajetet.pdf
    • https://cdn.shopify.com/s/files/1/0432/6309/9040/files/mipebefefafuvawujuniwix.pdf
    • https://cdn.shopify.com/s/files/1/0437/6284/3797/files/rijomexa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/63503140726.pdf
    • https://cdn.shopify.com/s/files/1/0438/1959/7981/files/61173213621.pdf
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/sagesorupukosesizosojoge.pdf
    • https://cdn.shopify.com/s/files/1/0428/2282/8198/files/10429943472.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000622b.bin
d116f404a38621bca490ad0fa489f1f999e4c1a5c4682e2db87a65bfef1dc524		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622B 5256 bytes
font_01_sfnt_off000073d3.bin
c7a6a68eb5e5e81755b01f3990f50696c5652e71192758f3df817e632cfcd948		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D3 10488 bytes
font_02_sfnt_off000097b6.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97B6 4324 bytes

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