Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bffd7f99b60e69d…

MALICIOUS

PDF

45.6 KB Created: 2020-08-08 05:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 627608320c0811eafb6ce3491611e933 SHA-1: 9b54fc97871b57d8303275818f5a2e76b6280fb8 SHA-256: 0bffd7f99b60e69dbb48cc010688a08a7bf222d4002c982a6ec12db67ce250f2
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 a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to lure users into clicking malicious links. 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=business+correspondence+letter+format+pdf
    • http://tumumu.lisasturm.com/uploads/1/3/0/9/130969754/lajub-tewiwefozaxaro-padafotafi-pijewuvobalu.pdf
    • http://files.artventures.org.uk/uploads/1/3/2/7/132740485/4258023.pdf
    • http://files.saimmconsulting.com/uploads/1/3/0/7/130740376/vovulozanurelovuv.pdf
    • http://files.pickypencil.com/uploads/1/3/0/8/130874110/1273935.pdf
    • http://files.colhenryart.net/uploads/1/3/0/7/130739570/pisirar-vuzekuxufun-fuvapetober.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5663/4785/files/80585011369.pdf
    • https://cdn.shopify.com/s/files/1/0435/8415/9903/files/two_many_items_1._7._2.pdf
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/capas_de_atmosfera_y_sus_caracteristicas.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/line_drawing_algorithms_in_computer_graphics.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xumilegimazuguvabunozanik.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/path_2_0_9_5_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/8846/9411/files/22689390802.pdf
    • https://cdn.shopify.com/s/files/1/0431/5329/3469/files/canada_map_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7051/files/discord_formatting_codes.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/fallout_tale_of_two_wastelands_mods.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4700/files/85810573815.pdf
    • https://cdn.shopify.com/s/files/1/0436/8682/2053/files/57441563918.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073ae.bin
5494cc33debfaabbab8006c99aed045eee99e64d8cfd6d2555d0690c52729d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73AE 5348 bytes
font_01_sfnt_off000085c6.bin
02e65998ef75c4f13298c90c8c7a9bb71e57a7d985e4479727cf910c89798401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85C6 10280 bytes

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