Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2845d61e8d8cc8a…

MALICIOUS

PDF

42.3 KB Created: 2020-08-21 15:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8c894c235c7d078b27e564d25a9af5d SHA-1: 8d287b5b444eb4a5403c0e6683b3369d73e59f1e SHA-256: e2845d61e8d8cc8ae1ba24b70efde68a99ec6b729fe8065dd4770aecd758c5ab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Algebra 1 glencoe mcgraw hill workbook answers' and the malicious URL, suggesting a lure to disguise the malicious intent. 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.ru/pify?keyword=algebra+1+glencoe+mcgraw+hill+workbook+answers
    • http://files.ryanshowland.com/uploads/1/3/1/4/131407226/28a93f8bea562.pdf
    • http://files.northernillinoispainting.com/uploads/1/3/0/8/130813616/6243007.pdf
    • http://dijenat.rootandbranchderbyshire.org/uploads/1/3/2/6/132681352/zifudavi.pdf
    • http://files.slingsandroundabouts.com.au/uploads/1/3/1/4/131437987/fopemebirinusor.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6055/files/building_materials_and_construction_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/6038/8252/files/54947849517.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/research_articles_on_supply_chain_management.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/velifafamar.pdf
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/tosos.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8839/files/solisi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/15025227395.pdf
    • https://cdn.shopify.com/s/files/1/0429/4089/1292/files/signed_file_example.pdf
    • https://cdn.shopify.com/s/files/1/0434/3844/0598/files/55027308288.pdf
    • https://cdn.shopify.com/s/files/1/0432/6939/0500/files/englishman_in_new_york_sheet_music_saxophone.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/51639399055.pdf
    • https://cdn.shopify.com/s/files/1/0437/4321/5767/files/53584345116.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/fikojogi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/functional_requirements_of_online_railway_reservation_system.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065a8.bin
d008c860fdbd35455ff98c0cb13c55a636ca9540e2dc63c709391e1713c39abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A8 5552 bytes
font_01_sfnt_off0000786c.bin
798aadb8084cb8edd9ca0b62a2a9f29a753e09049b0a08414a721331e06eca52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x786C 10232 bytes

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