Malicious PDF — malware analysis report

Static analysis result for SHA-256 b139c9289e991895…

MALICIOUS

PDF

67.9 KB Created: 2020-09-02 20:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bfe1b0c4348d7d6650dff16738d8747 SHA-1: d251237155347c2d2afddc5371815130d975a3d1 SHA-256: b139c9289e9918952616516d3e5124cd39e6845045de4994545b76a92450d4f9
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=emotional+intelligence+self+assessment+pdf'. This URL is presented within the document body, disguised as a link to an emotional intelligence self-assessment PDF. The presence of a large number of external PDF links, many pointing to Shopify domains, suggests a link farm intended to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=emotional+intelligence+self+assessment+pdf
    • https://cdn.shopify.com/s/files/1/0431/3337/0522/files/codycross_answers_group_11_puzzle_5.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1952/files/8423580374.pdf
    • https://cdn.shopify.com/s/files/1/0433/6756/3418/files/53297958346.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/fugusefugafa.pdf
    • https://static.usrfiles.com/ugd/73f3b0_6c4b8bce66f244f8bb5b022ea4be0189.pdf
    • https://static.usrfiles.com/ugd/2ac701_89dd90873d43461bb2132c7b17a509de.pdf
    • https://static.usrfiles.com/ugd/c5d40f_1a8c854ddea14d0ca294bf13e666ffb1.pdf
    • https://static.usrfiles.com/ugd/eb6612_5ec2a127da6f49b58ccc38e25ccf13d1.pdf
    • https://static.usrfiles.com/ugd/c12414_8ab8da047124420abb5fa1c5b9d98451.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5609/files/java_hashmap_get_by_index.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/bubble_shooter_3_game_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7096/files/geometric_progression_examples_with_solutions.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_off0000cb4a.bin
5e45d16f1db824dc9feee50deb6273ce832faf721f4882ee6e7d67b18f0f0f98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 5336 bytes
font_01_sfnt_off0000dd66.bin
dd8819f2faa8172edd04614fcadeba3c51213a4ea352e576ff46ac55bad28e5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 10996 bytes

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