Malicious PDF — malware analysis report

Static analysis result for SHA-256 af405f8cfc5f19ef…

MALICIOUS

PDF

42.0 KB Created: 2020-08-25 09:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0426880e41672ae97c13a1d0ac48adc5 SHA-1: 7be3fcc2fbe413da1e0b1ca43f7084ec1350644f SHA-256: af405f8cfc5f19ef974aeb310690bdb4d3761ec9689a6507d532086841954417
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=south+africa+history+pdf'. This indicates a phishing or social engineering attempt to redirect the user to malicious content. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility and traffic to the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=south+africa+history+pdf
    • http://files.sinkourship.org/uploads/1/3/1/4/131407164/55517a.pdf
    • http://files.adventuresuntethered.com/uploads/1/3/2/7/132740633/fda838e6a882.pdf
    • https://cdn.shopify.com/s/files/1/0454/7867/4584/files/97615875103.pdf
    • https://cdn.shopify.com/s/files/1/0434/6819/3952/files/ocr_arabic_to_excel_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nifafujejugafux.pdf
    • https://cdn.shopify.com/s/files/1/0440/7577/8198/files/mental_math_tricks.pdf
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/wuwisipepelelawajavuji.pdf
    • https://cdn.shopify.com/s/files/1/0432/0886/8008/files/gasetebedovupediwefeje.pdf
    • https://cdn.shopify.com/s/files/1/0438/0160/8349/files/mudaditemapukat.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8209/files/63036612605.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6909/files/grattan_institute_report_on_housing_affordability.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/robumawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6794/9724/files/kawinejimugose.pdf
    • https://cdn.shopify.com/s/files/1/0438/4371/5222/files/18045343315.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_off00006703.bin
56b069c4b905706be25e3d6270303126f9b499da8c2e3fabde87e5af158c2b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6703 5416 bytes
font_01_sfnt_off0000796f.bin
e6740f5d306e7857840872b6739f6fbec505739619fb8d6726e26088c147af06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x796F 9980 bytes

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