Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afc3926c510f5db…

MALICIOUS

PDF

47.4 KB Created: 2020-08-12 12:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3315dcddab81cea238b1ca119dd5dd62 SHA-1: 2b04a4460e5cae6e61946f642c7c3c586a7e6848 SHA-256: 0afc3926c510f5dbf3a71ab69589e0fc9e0d9cf2682a6a801019fb17a3dabb75
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to manipulate search engine results. One prominent URL, https://ttraff.ru/pify?keyword=grade+2+phonics+test+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a "grade 2 phonics test pdf" and the authoring application, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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=grade+2+phonics+test+pdf
    • http://files.tassietucker.net/uploads/1/3/1/3/131378915/830eb79b80406ae.pdf
    • http://zikeki.cutlerbayautocare.com/uploads/1/3/1/0/131070722/7272600.pdf
    • http://files.goldtimeradio.net/uploads/1/3/1/0/131069934/xinevezim_meranofukilolad.pdf
    • http://files.dancingtribescotland.com/uploads/1/3/2/3/132302780/ab6ddae7.pdf
    • http://files.lisawarns.com/uploads/1/3/0/7/130738876/piropemogogemeranid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1765/6728/files/mivuwelujabisimajunate.pdf
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/10447185319.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4564/files/mejeroxanidobabepi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4620/7650/files/10137409339.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/86354486381.pdf
    • https://cdn.shopify.com/s/files/1/0430/0183/9775/files/puguvafosulek.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/libumawezitudowilifawi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8366/1461/files/2087707643.pdf
    • https://cdn.shopify.com/s/files/1/0440/6129/4757/files/tedegevix.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/29833843691.pdf
    • https://cdn.shopify.com/s/files/1/0432/2987/2292/files/48977649943.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_off00006fe9.bin
a3cdb532bc8366a255860b9397f744519a7d833738df1aedec4ce6f66035b852		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE9 3144 bytes
font_01_sfnt_off00007b0b.bin
ddd06bbc623e437f4e7ae1ada0dbdef9affb11c6c8667cbfba9e8022e9bb0169		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0B 5372 bytes
font_02_sfnt_off00008d4f.bin
e4439fd04f1a58524d592cb9475f40d7fce5f57a28dff79e5f54dcbbae478203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4F 10100 bytes

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