Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4039453b4bee41…

MALICIOUS

PDF

45.3 KB Created: 2020-07-30 11:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dede0086a5c5968c72bbf9232aff817 SHA-1: 556859b8c45c5cdb62a3ff1b3008f93ec28e1371 SHA-256: ad4039453b4bee417663947aba44c1d9329219f0d44583cdffe6b41140c1755a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm behavior, with numerous links, many hosted on Shopify, likely for SEO poisoning to attract victims. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the heuristic firings strongly indicate a malicious redirection attempt.

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=accounting+information+system+notes+pdf
    • http://files.mrjgray.com/uploads/1/3/2/7/132741334/sukizorajekap.pdf
    • http://files.loveandmercyfdc.com/uploads/1/3/1/8/131857071/tazowirujuvimi.pdf
    • http://files.flolights.org/uploads/1/3/0/9/130970001/lomozubib.pdf
    • http://files.charleswmorganmodel.com/uploads/1/3/1/0/131071164/70cd9cc3988.pdf
    • http://files.shallowatereducationfoundation.org/uploads/1/3/0/9/130969966/71f26a2c3daf85.pdf
    • http://files.charleswmorganmodel.com/uploads/1/3/1/0/131071164/70cd
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lufixupiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8921/files/wamugigawodamakewubidirop.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1555/files/86889482853.pdf
    • https://cdn.shopify.com/s/files/1/0429/1703/6198/files/81414064774.pdf
    • https://cdn.shopify.com/s/files/1/0429/1752/7715/files/fotajaxesegoveb.pdf
    • https://cdn.shopify.com/s/files/1/0432/3160/8989/files/84240263924.pdf
    • https://cdn.shopify.com/s/files/1/0435/6361/4369/files/73791628145.pdf
    • https://cdn.shopify.com/s/files/1/0435/6423/6968/files/kexokowigokovatamedu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/sifaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/zinekojenidan.pdf
    • https://cdn.shopify.com/s/files/1/0434/6668/6629/files/sumixamer.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_off000072e0.bin
cb5cc27ee51db6aa6986a916d00907787c26c681b3a7e6355871c1aa5fc05a4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E0 5416 bytes
font_01_sfnt_off00008535.bin
d11afd9ae97d775c6bfa06bf9744c4db8d5af9b0ec4ecfb17464b70f8bd5756f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8535 10132 bytes

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