Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf62d1436af9502d…

MALICIOUS

PDF

66.6 KB Created: 2020-08-19 19:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24ce30131ac63a109a0a29c835f8a2eb SHA-1: 1d07d2ad35be716a303de9682c79e8eb2bbc163d SHA-256: cf62d1436af9502d672618019a63f88e077a7c84bd359e55d9c80476de87e5d0
154 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 pointing to 'https://ttraff.com/pify?keyword=ccs+for+ubuntu'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of outbound links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the same redirector URL and a benign-looking Shopify URL, suggesting a lure to a malicious site. No scripts were extracted from this sample.

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.com/pify?keyword=ccs+for+ubuntu
    • http://files.victoriarefinishing.com/uploads/1/3/2/7/132740978/bbfac67.pdf
    • http://files.borderskirental.com/uploads/1/3/2/6/132695519/991c33ed2a3ee3a.pdf
    • http://files.amandathompsonphoto.com/uploads/1/3/0/9/130969746/jaxarep-jizifudofu-gabasaf-jefobomabevobu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/51416252927.pdf
    • https://cdn.shopify.com/s/files/1/0430/0151/2090/files/fowogedekilizebo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5829/0070/files/17670404482.pdf
    • https://cdn.shopify.com/s/files/1/0440/4091/3046/files/59454701994.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/53044671646.pdf
    • https://cdn.shopify.com/s/files/1/0428/9085/4566/files/40891302741.pdf
    • https://cdn.shopify.com/s/files/1/0432/4317/6091/files/download_showbox_on_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0437/6238/5045/files/interview_questions_on_javascript_and_jquery.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/25927728338.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/pafonisumufinarope.pdf
    • https://cdn.shopify.com/s/files/1/0431/8078/5823/files/set_typeface_bold_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a59d.bin
2fb0fd92f8985b60b24c605b4aee17b388855430a7f6919c70329cf597756a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA59D 4680 bytes
font_01_sfnt_off0000b58e.bin
ff25833fab0e46dabd019b135581d6360c94c78d73366ae157c22e8905f78aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB58E 16224 bytes
font_02_sfnt_off0000e839.bin
fe139538347d724e6b27dab22ead91fbb1eb3470a850438049392072e7f85921		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 16208 bytes

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