Malicious PDF — malware analysis report

Static analysis result for SHA-256 17001848c3db035e…

MALICIOUS

PDF

51.1 KB Created: 2020-08-10 08:39:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae81d3dd0fde483e0b80738a10e74ccb SHA-1: d72d32a53c54c691e4a5f782af796b48ced862d2 SHA-256: 17001848c3db035e51c5e14da76dc5d98ee139ec85c0ae54541663e65f32a442
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 redirector service identified as malicious. The document body, though heavily obfuscated, contains text related to 'electrical engineering technical interview questions and answers pdf' and a URL that aligns with this theme, suggesting a lure to a malicious site. The ML classifier also strongly indicated 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.cc/pify?keyword=electrical+engineering+technical+interview+questions+and+answers+pdf
    • http://files.carswellfitness.com/uploads/1/3/1/6/131606875/juwizezoru_bokig.pdf
    • http://files.curbcompost.org/uploads/1/3/1/6/131606127/8100798.pdf
    • http://files.geropsychtech.org/uploads/1/3/2/8/132814791/6062098.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/words_their_way_spelling_lists_4th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0434/8903/4402/files/7590527170.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0872/files/28115056202.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/49880679395.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1072/files/pijelagow.pdf
    • https://cdn.shopify.com/s/files/1/0440/7807/1960/files/sovorulojo.pdf
    • https://cdn.shopify.com/s/files/1/0436/3816/1561/files/frontline_magazine_june_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/4987/6630/files/mulipotazanidenirixuti.pdf
    • https://cdn.shopify.com/s/files/1/0440/0444/2262/files/catholic_liturgical_vestments.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4436/files/31240996732.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3188/files/adverbial_clause_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/84922312912.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/vikaxazodinusep.pdf
    • https://cdn.shopify.com/s/files/1/0430/4388/1114/files/koruj.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_off00007a34.bin
f0e7e72cdb36499d88eaed7281ebe1106326f1f622c509fda173dfc39fbeab4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A34 5536 bytes
font_01_sfnt_off00008d03.bin
4bc792426d741f039f7289b5732fdfeb32a67ea28e03dd5a27b7c8392bf7cae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D03 10540 bytes
font_02_sfnt_off0000b0d6.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D6 4324 bytes

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