Malicious PDF — malware analysis report

Static analysis result for SHA-256 8554ac6f866c0926…

MALICIOUS

PDF

56.2 KB Created: 2020-08-10 05:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 341d5ca46fd0c43f03689c9e9b564b3f SHA-1: 602e19a28306e6eaf6a6e7f927bd5d64355a1282 SHA-256: 8554ac6f866c0926e60749de2a8d94a60178db94fd91ac48fdfb89b6f4fd0668
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm designed to redirect users to other sites. One of the primary links, https://ttraff.ru/pify?keyword=class+10+biology+control+and+coordination+notes+pdf+dronstudy, is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to drive traffic to malicious infrastructure.

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=class+10+biology+control+and+coordination+notes+pdf+dronstudy
    • http://files.elementssalononline.com/uploads/1/3/0/7/130738836/puwifami.pdf
    • http://files.edfwarbirds.com/uploads/1/3/1/3/131383323/69ac67a520386.pdf
    • http://files.weddingsatheronswoodgarden.com/uploads/1/3/1/4/131407818/3377311.pdf
    • http://files.glutenfreeaf.com/uploads/1/3/0/9/130969012/misaguxerara.pdf
    • https://cdn.shopify.com/s/files/1/0431/2013/2247/files/chain_rule_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0454/9050/3832/files/el_viaje_del_heroe_joseph_campbell.pdf
    • https://cdn.shopify.com/s/files/1/0437/1116/8663/files/networking_study_guides.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/14657519577.pdf
    • https://cdn.shopify.com/s/files/1/0437/9816/7713/files/bujatenasoruvazuz.pdf
    • https://cdn.shopify.com/s/files/1/0439/9661/0718/files/womabubetemofakan.pdf
    • https://cdn.shopify.com/s/files/1/0436/1751/7731/files/fozobilisezuvu.pdf
    • https://cdn.shopify.com/s/files/1/0445/9456/1188/files/change_to_word_document_online.pdf
    • https://cdn.shopify.com/s/files/1/0435/5253/8787/files/52122312265.pdf
    • https://cdn.shopify.com/s/files/1/0433/5583/2469/files/76975793966.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/6225659347.pdf
    • https://cdn.shopify.com/s/files/1/0434/1035/8423/files/94851929241.pdf
    • https://cdn.shopify.com/s/files/1/0436/5398/8510/files/attestation_de_salaire_vierge.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000889b.bin
7ef742998438c9fa00f17322b9dd53a1b9e114b3501f0149e9efdebdb47492c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x889B 5664 bytes
font_01_sfnt_off00009bf2.bin
97ae266abe69a836fe2f130525bb8155300c2fcaa7b0232ff71112b6b3e75778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF2 9912 bytes
font_02_sfnt_off0000be22.bin
6d38ff9756b44e93370057f415a6b7525cfc4d36dc85ac4eaac6687eec13ddca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE22 16084 bytes

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