Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaf3af3063390af…

MALICIOUS

PDF

34.7 KB Created: 2020-08-16 17:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: baff8bd90244c76770b3ed23a9f937db SHA-1: 62e1ed374bdf5c0a004eab7b5a7826be49f2de86 SHA-256: cfaf3af3063390afc4d5052393817bcfa083b910efefba6aba927452f9ae533b
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used to create link farms for SEO poisoning or to direct users to malicious sites. One of the embedded URLs, https://ttraff.ru/pify?keyword=grapikong+pantulong+worksheet, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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=grapikong+pantulong+worksheet
    • http://files.phoenixwarriorssoftball.com/uploads/1/3/2/6/132682919/9407783.pdf
    • http://giwuked.nonstopfunsocal.com/uploads/1/3/1/4/131454065/b5b0c39c2ab7.pdf
    • http://files.emmabradleyphotography.com/uploads/1/3/1/3/131378942/9749c91549aa31.pdf
    • https://cdn.shopify.com/s/files/1/0434/5030/2616/files/22778566883.pdf
    • https://cdn.shopify.com/s/files/1/0434/6488/4384/files/vikikewaxug.pdf
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/artemis_fowl_the_eternity_code_graphic_novel.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/blind_flange_dimensions_chart.pdf
    • https://cdn.shopify.com/s/files/1/0437/8315/9969/files/24388089502.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/biostatistics_and_epidemiology_smoller.pdf
    • https://cdn.shopify.com/s/files/1/0452/6528/9378/files/android_studio_download_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0440/3727/5813/files/levonuviwisiko.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3414/files/bawim.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/architecture_of_computer_hardware.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1349/files/tremble_chords_g.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/26480409381.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/58830579255.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_off000049b7.bin
3c2f976da55aa983549a90f8200b4f0189f4ab2ef280133cbaf6c6aa72d316e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49B7 5268 bytes
font_01_sfnt_off00005bb2.bin
09dbe020a7c3e60332fa108e088c481d2dd04f7167ba69f83704391e5a420beb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB2 9616 bytes

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