Malicious PDF — malware analysis report

Static analysis result for SHA-256 1880c1327d2ef961…

MALICIOUS

PDF

45.1 KB Created: 2020-08-09 16:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfcfd8ef08d59fcbf6d212bedb0c1f9a SHA-1: e3ebfdccc8b194bf892d0aa1fb51095c6b48dfa1 SHA-256: 1880c1327d2ef961951bd1a8138c0d86e0dc2624d8c1bad8c441fd534ad33145
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free book download, which is a common social engineering tactic. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate the document is designed to lead users to potentially harmful content. Although no scripts were explicitly extracted, the nature of the embedded URLs and the ML classification strongly suggest malicious intent, likely to distribute further malware or phishing 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.cc/pify?keyword=molecular+genetics+books+free+download+pdf
    • http://files.karlperformancecustomshop.com/uploads/1/3/1/8/131856333/wuselogidex-rebisu.pdf
    • http://files.dgwengineering.com/uploads/1/3/1/3/131382721/1862990.pdf
    • http://badafox.erikaclaireart.com/uploads/1/3/1/6/131607600/4191504.pdf
    • http://files.bruinsconcretecanoe.org/uploads/1/3/1/4/131482968/d3d97506e5.pdf
    • http://files.gardeniacafeonline.com/uploads/1/3/1/0/131070611/wudatidugana.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/9330/2178/files/57816352301.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/29239778090.pdf
    • https://cdn.shopify.com/s/files/1/0429/4744/4899/files/89594880171.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/xusigeseg.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6218/files/24297434331.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8124/files/muzepogaduziludotunisas.pdf
    • https://cdn.shopify.com/s/files/1/0435/1816/5146/files/6979205762.pdf
    • https://cdn.shopify.com/s/files/1/0437/0232/1307/files/intermediate_market_leader_3rd_edition_business_english_course_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/pow_function_python.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/21846370518.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3117/files/42155059905.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/jevodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9015/7473/files/british_admiralty_chart_symbols.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_off000063c3.bin
189b3578f6fc57abadb165f04f87c138487d4c498529e8e0b2b223b8c005db04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C3 5504 bytes
font_01_sfnt_off000076a0.bin
cf0b29661ff716bd12da38f9555926c3e73278853f95ddc9e288189303d53675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A0 10016 bytes
font_02_sfnt_off000098d1.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98D1 4324 bytes

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