Malicious PDF — malware analysis report

Static analysis result for SHA-256 d269137fe3c6534a…

MALICIOUS

PDF

46.2 KB Created: 2020-08-11 13:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9a1bc290cf454edff2a08689c4d6300 SHA-1: 75c2345d478576b1a717e8158ca842a6c91eb7e6 SHA-256: d269137fe3c6534a0f7bf7a3631a4664e3e37602dec479161e2be1b62373922a
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many URLs pointing to Shopify-hosted PDFs. One of these links, https://ttraff.ru/pify?keyword=properties+of+carboxylic+acid+pdf, is identified as a known malicious redirector. The document body, though obfuscated, contains references to the topic 'properties of carboxylic acid pdf', likely a lure to entice users to click the malicious link. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or redirection attack.

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=properties+of+carboxylic+acid+pdf
    • http://files.geoffandwinnwright.com/uploads/1/3/1/4/131406592/fufevuwinezizu_xotusox.pdf
    • http://files.vinylwrapmilwaukee.com/uploads/1/3/1/0/131070212/5853807.pdf
    • http://files.heartworks.org/uploads/1/3/0/9/130969372/3335e69a47.pdf
    • http://files.jondillowcounseling.com/uploads/1/3/1/0/131070476/xavixeregexusot-punizokevad.pdf
    • http://kixarix.sarasotavirtual.com/uploads/1/3/0/8/130814328/4a671625aac0f.pdf
    • https://cdn.shopify.com/s/files/1/0438/1478/1088/files/bizowimunurogaxizibenuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/91691032862.pdf
    • https://cdn.shopify.com/s/files/1/0431/4418/3970/files/77294691300.pdf
    • https://cdn.shopify.com/s/files/1/0427/9861/2636/files/xutobolo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/21338289595.pdf
    • https://cdn.shopify.com/s/files/1/0428/8079/4790/files/29275933433.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4668/files/tawipuxagedo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/kufusesu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2323/5234/files/embedding_image_html.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/54007628658.pdf
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/4454518303.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/16978795140.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/supupaxagujemup.pdf
    • https://cdn.shopify.com/s/files/1/0436/0539/3570/files/74824900400.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_off00006c87.bin
2af1379189ef80ba57c5c036a3c2f63a55c538d7c1fb949d0892bffb60190442		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C87 5460 bytes
font_01_sfnt_off00007f25.bin
348b72f0aa666630509b91838afeb7b5c01967de41eb0d60538403d629e63b72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F25 14120 bytes

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