Malicious PDF — malware analysis report

Static analysis result for SHA-256 87223121797af938…

MALICIOUS

PDF

59.8 KB Created: 2020-08-22 08:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77510d33996c564ac962f4f34df814af SHA-1: b812aa495d2846e008a9b74851f133b4ed749f69 SHA-256: 87223121797af9386fa93abffd1b501058f8fe22f68757f23ceab803c71d5f6b
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, a technique often used for SEO manipulation or to host malicious content. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=android+sqlite+foreign+key+not+working', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt 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=android+sqlite+foreign+key+not+working
    • http://files.conniedillon.com/uploads/1/3/1/8/131857626/2385644.pdf
    • http://files.rmheatingandcooling.com/uploads/1/3/0/8/130814169/2817014.pdf
    • http://files.romboproductions.com/uploads/1/3/1/4/131452922/dovamogozegukuw_dilitutewono_masedor_jaxafenebuke.pdf
    • http://files.stefanomitrione.com/uploads/1/3/2/6/132695586/lefelakazubaju.pdf
    • http://bawowu.officialbluehangers.com/uploads/1/3/1/6/131636725/5014831.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1766/5703/files/consett_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0461/9999/6569/files/lr_baggs_lyric_installation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5970/7037/files/27551320450.pdf
    • https://cdn.shopify.com/s/files/1/0430/7448/6421/files/tatulabujevigemutowamijup.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/97630214779.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/blockchain_technology_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0436/0614/7235/files/beyond_the_sea_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5396/files/differential_calculus_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1871/files/47676587752.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5763/files/avancemos_4_textbook.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000099bb.bin
031cc786926906c06e6c744b5dac2e980ab4bf889f83b1b84e9d4773fc1ba45d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99BB 5340 bytes
font_01_sfnt_off0000ac39.bin
eef94c3cf8964d492dde082c5c954d3a95e961b6ae9650652d683a43b847ba77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC39 5240 bytes
font_02_sfnt_off0000be27.bin
9f4d53345f66d325ee5fe8c320b317b5330d0fde25cb870d31516a32699a9d7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE27 10320 bytes

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