Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41e86df34ac16be…

MALICIOUS

PDF

51.0 KB Created: 2020-08-25 14:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 165c11c5549a6914d0ca8ebc23db9bcd SHA-1: 67b90b2295ef5ad43dc92e52cfc049a58e417c10 SHA-256: d41e86df34ac16be698b05fbc0a5e24a509c50a7090f0a75ad2ca12b3399bf25
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, with one prominently pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains the string 'Biology class 12th ncert book pdf', suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness. The presence of numerous links to Shopify-hosted PDFs suggests a link farm for SEO manipulation, likely to improve the ranking of the malicious redirector.

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=biology+class+12th+ncert+book+pdf
    • http://files.midnightlight.ca/uploads/1/3/0/7/130775229/7164851.pdf
    • http://terijel.homehealthbettercare.com/uploads/1/3/0/8/130874376/lizez_pupomalod_beteludirem.pdf
    • http://files.groovygurugranola.com/uploads/1/3/1/4/131452904/9097829.pdf
    • http://files.mhcgb.co.uk/uploads/1/3/1/8/131856150/lotemopujedoboda.pdf
    • http://files.xochis.com/uploads/1/3/0/8/130813364/7f6dd5de3c04.pdf
    • http://files.midnight
    • https://cdn.shopify.com/s/files/1/0431/6522/1015/files/91544415925.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/4844583046.pdf
    • https://cdn.shopify.com/s/files/1/0427/6980/9564/files/robavojuwuzaz.pdf
    • https://cdn.shopify.com/s/files/1/0439/3595/7147/files/canara_bank_saving_account_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/thomas_dolby_hyperactive.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/lifurulatigigo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/10945712984.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3768/files/botumojulepesu.pdf
    • https://cdn.shopify.com/s/files/1/0440/1758/2230/files/digoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/22992974188.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/pezalujonupovusi.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_off00007be2.bin
2fa9da3602bc8730af681303ecea4e2fd2b8637796ea7f294807cf7c18fc3b73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE2 5956 bytes
font_01_sfnt_off00009018.bin
c8d027216e0d28e8ed00ab88df770776050925eafeed971bfd200459c68c4aea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9018 9944 bytes
font_02_sfnt_off0000b259.bin
64d8c22c8d37e77389ba11168dc19ee95ec2be9b4471c069115bb8f89ef30eff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB259 3060 bytes

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