Malicious PDF — malware analysis report

Static analysis result for SHA-256 0405a911feb3e172…

MALICIOUS

PDF

108.1 KB Created: 2020-08-11 05:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d03746c15aaa69e492861444dc27ea46 SHA-1: ae86871954c5823a156b5b89fbdc0cb490d98c4e SHA-256: 0405a911feb3e1729de9232452c4f4029439bbe7c31507470e7d2c6c63307216
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the document body, though obfuscated, contains a URL matching the malicious redirector. This suggests the primary purpose is to redirect users to potentially harmful content.

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=annex+11+air+traffic+services+pdf
    • http://files.brainandspinegroup.org/uploads/1/3/1/4/131438557/34a82.pdf
    • http://rodabapef.ivyshi.org/uploads/1/3/1/3/131380042/3581c4b4143.pdf
    • http://files.thecovenantschristandyou.com/uploads/1/3/1/3/131379434/94345039.pdf
    • http://files.akersart.com/uploads/1/3/1/1/131164112/784f16.pdf
    • http://files.100menwhocarequinte.com/uploads/1/3/2/7/132741302/zuwetekovatiso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2991/4012/files/sample_letter_of_intent_to_buy_property.pdf
    • https://cdn.shopify.com/s/files/1/0435/4896/7061/files/history_alive_the_medieval_world_and_beyond.pdf
    • https://cdn.shopify.com/s/files/1/0438/9021/3019/files/gelabiruluxupupupi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1257/9747/files/fejon.pdf
    • https://cdn.shopify.com/s/files/1/0439/7613/0718/files/jcps_school_calendar_2015-_16.pdf
    • https://cdn.shopify.com/s/files/1/0433/0160/1444/files/bunk_bed_plans_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/92940560562.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8239/files/bgp_routing_protocol_configuration.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/7390775150.pdf
    • https://cdn.shopify.com/s/files/1/0435/0106/0262/files/xagovimegokujixulad.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/phonics_flashcards_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/82415961195.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_off00016f12.bin
15f06b3bfa173402f5bd3dbb94d9c00146e8f85e954a7db3a21d89126893565e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F12 5288 bytes
font_01_sfnt_off00018125.bin
e791ea4bd3cafdf562c8c4c21552b149bd21fa95f364659f8b34f49ca13f8d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18125 9980 bytes

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