Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88265c7c114e8bb…

MALICIOUS

PDF

68.9 KB Created: 2020-08-20 11:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c72d294e383fc859c2d9bee6995069fc SHA-1: 8a0d3f67a1db8bccebbb99a0877c88ef97c8dcd5 SHA-256: e88265c7c114e8bb5ec486d1b5625de90172b7fca61043d1940facff1d749eb7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL as the malicious link, suggesting an attempt to disguise the malicious intent with seemingly educational content. 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=adding+independent+and+dependent+clauses+worksheet+answers
    • http://files.okaykosmetics.ca/uploads/1/3/1/8/131856166/sisokez.pdf
    • http://degupafa.911tacmed.com/uploads/1/3/1/4/131407300/napefenopudixamidivi.pdf
    • http://zevopafa.nickelodeonco.com/uploads/1/3/0/8/130874123/javajirazuvagu.pdf
    • http://files.eugeneglassroots.com/uploads/1/3/0/7/130776063/1709607.pdf
    • https://cdn.shopify.com/s/files/1/0432/7420/7387/files/mizawipaguvafelazaze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovaratumu.pdf
    • https://cdn.shopify.com/s/files/1/0440/4209/2694/files/count_dankula_discord.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/lymphatic_organs_and_tissues.pdf
    • https://cdn.shopify.com/s/files/1/0428/8921/6167/files/26995384543.pdf
    • https://cdn.shopify.com/s/files/1/0432/7319/1580/files/10400786070.pdf
    • https://cdn.shopify.com/s/files/1/0441/3105/7816/files/60685527967.pdf
    • https://cdn.shopify.com/s/files/1/0432/5143/3627/files/advanced_excel_formula_file.pdf
    • https://cdn.shopify.com/s/files/1/0431/9114/0510/files/blessed_assurance_hymn_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0441/2522/5112/files/lemudusuxodojebusuki.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/zubob.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/fevanepogalosemozem.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7243/files/78479456830.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_off0000c6b7.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B7 2828 bytes
font_01_sfnt_off0000d0b2.bin
dd8144fb73cbbae41dffcec3a5806367cc80a3d9627cefa95486e6940b626aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B2 5480 bytes
font_02_sfnt_off0000e357.bin
4be71c3906d4265d145cfc449560f0863e1cdb660b08998cce291fc8b5dbf75b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 10064 bytes

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