Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacb3ca49cda224a…

MALICIOUS

PDF

40.1 KB Created: 2020-08-06 21:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a33878a5f67149a578099b64b7343f58 SHA-1: dc6b58e3940d07bc6cb21c2db62caeddba26120e SHA-256: aacb3ca49cda224a648e11a39a9e9d470b39eeec1b58f1021ec5cf68a234e5cc
150 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at `https://ttraff.ru/pify?keyword=adobe+reader+file+convert+to+pdf+online`. The document body, though heavily obfuscated, appears to contain text related to PDF conversion and includes this malicious URL. The presence of a large number of external links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content.

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=adobe+reader+file+convert+to+pdf+online
    • http://digor.danniles.com/uploads/1/3/1/4/131454024/mulexilemoxafuvalas.pdf
    • http://tinoj.capecodsharkdiver.com/uploads/1/3/1/3/131398020/foxogakelajud_juvisuf_takujejebezuj.pdf
    • http://files.melissacharlesart.com/uploads/1/3/1/3/131379409/407cdc6e15.pdf
    • http://files.psusdarts.org/uploads/1/3/2/6/132696512/gopimavex.pdf
    • http://files.operationhelpahero.org/uploads/1/3/0/7/130775953/225d0e275.pdf
    • https://cdn.shopify.com/s/files/1/0450/9194/6661/files/avery_8460_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/aditivos_de_concreto.pdf
    • https://cdn.shopify.com/s/files/1/0434/2756/1634/files/buninokixinezawol.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/37676744636.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3576/files/osrs_lost_city_quick_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/8992/8096/files/complete_oxford_english_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdf
    • https://cdn.shopify.com/s/files/1/0429/5580/0739/files/lojupipesojomowegixonejap.pdf
    • https://cdn.shopify.com/s/files/1/0432/3088/8094/files/26808962471.pdf
    • https://cdn.shopify.com/s/files/1/0434/5213/7622/files/2pac_greatest_hits_rar.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/jenusaw.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_off0000608f.bin
0cb357cc8eb200663163916ec5ba8860bb2ae5a0245f05fb8dbc578872863570		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608F 5160 bytes
font_01_sfnt_off00007233.bin
86ffd5b11f1737b2fff9dd84de31214800378c778ba9d839e7082b4e1d3589db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7233 9732 bytes

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