Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d8ca9c01575ab9…

MALICIOUS

PDF

34.5 KB Created: 2020-08-29 23:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05489f9e426fd091030241d8fe6be299 SHA-1: 8db17477ca59f6b7a53f3f20c99b36ccf746d524 SHA-256: e3d8ca9c01575ab91f3b1dde90a1e6cec45022c64e6729c1568aaa67f24a25ed
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links, 'https://ttraff.com/wix?keyword=we+believe+study+guides', points to a known malicious redirector. The document also exhibits characteristics of a PDF link farm, with numerous links pointing to Shopify domains, likely as a method to disguise the true malicious intent. The primary attack pattern involves luring the user to click on malicious links within the document.

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.com/wix?keyword=we+believe+study+guides
    • https://cdn.shopify.com/s/files/1/0433/9286/0327/files/rand_mcnally_mileage.pdf
    • https://cdn.shopify.com/s/files/1/0434/5305/5128/files/74423418411.pdf
    • https://cdn.shopify.com/s/files/1/0438/4237/1741/files/55935315533.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/84103439612.pdf
    • https://cdn.shopify.com/s/files/1/0440/3603/0629/files/15092896568.pdf
    • https://cdn.shopify.com/s/files/1/0447/4834/1399/files/quantitative_aptitude_questions_and_answers_for_ssc.pdf
    • https://cdn.shopify.com/s/files/1/0433/1307/0238/files/gexupegezer.pdf
    • https://cdn.shopify.com/s/files/1/0438/6465/3984/files/96995447406.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/farofopedosuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/pokemon_go_curveball_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0556/6366/files/vosorekekefowaxajajida.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a6bda7af1f449e880e4ca11bba2ed33.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf34964ee53040f0ae4f55e428970441.pdf
    • https://static.usrfiles.com/ugd/10b11f_41212622827a46249957682081b46696.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_f7f69081cc534864be65f354f89de35a.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_off00004931.bin
8276ba46133bcc912837826091bf77074d874d592c8d99b69e2614a3c9472ab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4931 5000 bytes
font_01_sfnt_off00005a5c.bin
1bda8c1579383d2dd0e32bbda18605f56ba015c47f953d1156c30e208fbcf0d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5C 10304 bytes

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