Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48b6c2ba8e795aa…

MALICIOUS

PDF

48.0 KB Created: 2020-08-03 17:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f2df64051af6f9182a543bb93cadaa5 SHA-1: e544b97d0f5f6780effc619c40869ce3e93ea0da SHA-256: b48b6c2ba8e795aa699dc824d57247e4231673be4141c527b41d0ee944074769
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with a primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the string 'https://ttraff.ru/pify?keyword=jspdf+autotable+hooks', indicating a lure to a malicious site. The presence of numerous PDF links suggests a strategy to distribute malicious content or traffic. The ML classifier also strongly flagged this PDF as malicious.

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=jspdf+autotable+hooks
    • http://files.d123edfoundation.org/uploads/1/3/1/4/131453018/pojuruvidupa.pdf
    • http://files.bitesbk.com/uploads/1/3/0/7/130739117/e2f4f0c03946.pdf
    • http://files.thezoneevents.com/uploads/1/3/2/6/132695301/1689e08f7e5a9.pdf
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/demiridaposor.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7186/files/xofonix.pdf
    • https://cdn.shopify.com/s/files/1/0448/3599/5808/files/business_driven_technology_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/49808152266.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/metexaw.pdf
    • https://cdn.shopify.com/s/files/1/0427/5788/2022/files/pelitinaditapu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tokisesuzarutaxiwiru.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/burot.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/fewilumafuvag.pdf
    • https://cdn.shopify.com/s/files/1/0437/5566/7605/files/contemporary_abstract_algebra_gallian.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_off000071ac.bin
8ba6f895fd373416baf8c6217dceaf513b34d90f68d92c9fb505d94c449296b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71AC 5224 bytes
font_01_sfnt_off0000836a.bin
00d534aea434698cebd3485c0e18befb2af24f5a5d6a0d53a49d791df0030885		 pdf-font-stream PDF embedded font (sfnt) at offset 0x836A 14348 bytes

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