Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ef0af7298b6baf…

MALICIOUS

PDF

60.2 KB Created: 2020-08-03 16:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97aedefcfd90729712670d3f01353c79 SHA-1: 5f87f5d82758c9395ebf3d656616e5280ff64971 SHA-256: 83ef0af7298b6baf26892414763c22dfa884505629b1c259bdd5db7ea8c5ce1e
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 of which point to potentially malicious redirectors or link farms. The primary malicious link identified is 'https://ttraff.com/pify?keyword=sri+devi+bhagavatam+sanskrit+pdf', which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links to Shopify-hosted PDFs, suggesting a link-farming or phishing attempt.

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.com/pify?keyword=sri+devi+bhagavatam+sanskrit+pdf
    • http://bawege.perkinstherapygroup.com/uploads/1/3/2/7/132712093/1839687.pdf
    • http://wijos.chance-initiative.org/uploads/1/3/2/7/132740978/zonep_renulasibelum.pdf
    • http://files.handmadebylouisa.com/uploads/1/3/0/7/130775827/25f7f89e987e0.pdf
    • http://files.simixagriculture.com/uploads/1/3/1/4/131438002/kipaz-fixab-bepasifupomogaw-naxovot.pdf
    • http://files.ashtabulafirstumc.com/uploads/1/3/0/8/130814355/basigogepixi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/dowuwerorerejeti.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0843/files/53048976882.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/moduzibupazokemekowi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/44560629403.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/47697522165.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9157/files/61367613629.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/mijejivatupegonajod.pdf
    • https://cdn.shopify.com/s/files/1/0429/4737/9356/files/tonub.pdf
    • https://cdn.shopify.com/s/files/1/0430/8022/0826/files/suno_na_sangemarmar_songs.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49893706483.pdf
    • https://cdn.shopify.com/s/files/1/0430/8860/9429/files/97892977476.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/pazafisitawuza.pdf
    • https://cdn.shopify.com/s/files/1/0437/5409/4753/files/zukowin.pdf
    • https://cdn.shopify.com/s/files/1/0431/0768/0405/files/59168370112.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_off00009874.bin
8b5a423c973c25f79e6fad9c80d5a21aeadea30ee464c0abe8f685e0b7a69ad1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9874 5792 bytes
font_01_sfnt_off0000ac04.bin
99145234f856b1870b8ee91db2cb1acf9c19f0bbc3e0eab194e45d5955b222df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC04 10260 bytes
font_02_sfnt_off0000cf52.bin
80a4b5e6c1076d0b21b4c6c8e7408dae355b2129d98cb88c98a9ba1a2000fb37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF52 5636 bytes

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