Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9c8b18332cfae6…

MALICIOUS

PDF

40.2 KB Created: 2020-07-31 23:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a6f8cc9d6ae130b4db4b3ccce0b4b74 SHA-1: 3b4aecffb91115ceea49c6a4940c94e312411b36 SHA-256: fc9c8b18332cfae6381d4f9c365f260b10879a5806abfc42781d467ed2cb70b2
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=weather+studies+investigations+manual+answer+key', is flagged as a malicious redirector. The document body, though partially corrupted, includes this URL and suggests a lure related to an answer key. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=weather+studies+investigations+manual+answer+key
    • http://files.bikhatabirmans.com/uploads/1/3/1/4/131452944/pejeguzubobex.pdf
    • http://files.behavioralcompassgroup.com/uploads/1/3/1/4/131453818/raremez.pdf
    • http://files.bulldogrestorationservices.com/uploads/1/3/1/8/131857565/namonekikibeworazix.pdf
    • http://files.hohnesroadplayhouse.com/uploads/1/3/1/4/131453396/vedomekire.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nunirisolifugonogebivaxez.pdf
    • https://cdn.shopify.com/s/files/1/0435/5548/7905/files/sasovobotajaban.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/peketuwawiradawe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/28798090800.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40323832667.pdf
    • https://cdn.shopify.com/s/files/1/0433/6268/0984/files/wanub.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/98573802451.pdf
    • https://cdn.shopify.com/s/files/1/0433/5350/5946/files/zukodaniwurexozatako.pdf
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/kobogumade.pdf
    • https://cdn.shopify.com/s/files/1/0435/5578/2817/files/87002897782.pdf
    • https://cdn.shopify.com/s/files/1/0429/9315/6259/files/gelomifajipiji.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/61977280899.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/44243045730.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_off00005123.bin
e62afa3fcc85ac1fd8c53c0e2939da09d409d0573fec5d9aef1a6ccd8125c91e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5123 5452 bytes
font_01_sfnt_off0000639b.bin
4145495d0d6144c26d5412c9acd5b2ca0153b62e8c90e91c6d65931f4cf66dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x639B 9856 bytes
font_02_sfnt_off0000855a.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x855A 4324 bytes

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