Malicious PDF — malware analysis report

Static analysis result for SHA-256 718fc42a9df8680a…

MALICIOUS

PDF

52.0 KB Created: 2020-08-28 00:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0370dfcf37a0b9c8120664c1dc67ffe1 SHA-1: 299dfac3adc56ba98b632eb1e36c49413a3a78e2 SHA-256: 718fc42a9df8680a5d9cdb0a2293080b9c67a71938aeb386a5a700a79798a84a
162 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 a redirector service known for malicious activity. The document body, though obfuscated, contains a URL that mirrors a search query for academic solutions, suggesting a lure to trick users into clicking malicious links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector and link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=hecht+optics+5th+edition+solutions+pdf
    • http://files.oldpueblosoapery.com/uploads/1/3/1/8/131856409/5561010.pdf
    • http://vimoni.oilbalance.com/uploads/1/3/1/4/131406082/2555543.pdf
    • http://files.kosmocompany.com/uploads/1/3/2/7/132740798/doviligetunipunego.pdf
    • http://files.elishiareynolds.com/uploads/1/3/1/4/131407823/4659880.pdf
    • http://lepijid.eliteathleticclub.com/uploads/1/3/1/0/131070722/4100436.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.pdf
    • https://cdn.shopify.com/s/files/1/0437/9348/1889/files/ultimate_mortal_kombat_3_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/pokadaxuguniv.pdf
    • https://cdn.shopify.com/s/files/1/0432/5549/6866/files/renusubagewefitas.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/the_great_gatsby_study_guide_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/1768/9498/files/taxolevevosulikamigexojuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/database_hoarding_and_caching_techniques_in_mobile_computing.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/all_quiet_on_the_western_front_full_text.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/53090989756.pdf
    • https://cdn.shopify.com/s/files/1/0429/6173/1743/files/lenalinukofagozije.pdf
    • https://cdn.shopify.com/s/files/1/0434/1848/4888/files/sojuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/7767/2868/files/ielts_reading_test_answer_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/learn_basic_thai_language.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ce1.bin
34fcf105473d6972b7d04c5fe1d65e11c0013ee17a4505ed0d82bba8beed4bf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE1 5024 bytes
font_01_sfnt_off00007df8.bin
75ff36473735e0a0ce161823e910d1c0a0e2944a08dc426d12003c9f76689a86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF8 15164 bytes
font_02_sfnt_off0000ad45.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD45 16204 bytes

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