Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f9a93b06e18c4d…

MALICIOUS

PDF

43.1 KB Created: 2020-09-02 01:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebd7f0e18ad8c01d4f00973e03c41945 SHA-1: 95c8a4840e8b0f86246191d62500ee2f0e238a72 SHA-256: 53f9a93b06e18c4db55adaf2b13740f0c50741b5bd08764c0f33b0ee411d6af4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. This URL is used in a lure related to 'automata tamil dubbed movie', suggesting a social engineering tactic to trick users into clicking the link. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, further supporting the malicious intent. No scripts were extracted, but the presence of a malicious redirector is sufficient evidence of malicious activity.

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/wix?keyword=automata+tamil+dubbed+movie
    • https://static.usrfiles.com/ugd/2c8d66_23efda012d0e4aa19c43a4a53a4171b0.pdf
    • https://static.usrfiles.com/ugd/09273f_45fdf7ad9ff64c24821923f684d4fa43.pdf
    • https://static.usrfiles.com/ugd/9421c8_0226703908e342449872a64973956add.pdf
    • https://static.usrfiles.com/ugd/2ac701_e2adcefa6dc2459ca4d7b1baf0886345.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0a1acd69a744bdc87d22a4cbe0bff06.pdf
    • https://cdn.shopify.com/s/files/1/0433/7929/4358/files/tutile.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8368/files/medoxavuwago.pdf
    • https://cdn.shopify.com/s/files/1/0430/7494/5184/files/fasepumud.pdf
    • https://cdn.shopify.com/s/files/1/0437/6503/9261/files/45692894832.pdf
    • https://cdn.shopify.com/s/files/1/0434/7419/0498/files/kuvik.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbd587d567d54cbfa75066e5bd6bfa59.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c3396a730224ef3be5a2a9c5f2265b8.pdf
    • https://static.usrfiles.com/ugd/11f207_1a5d78fdea9649efaa5928630894e21f.pdf
    • https://static.usrfiles.com/ugd/934fc3_53538305b3b0468394ca7f58444f391e.pdf
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/96033501916.pdf
    • https://cdn.shopify.com/s/files/1/0432/9386/8187/files/72973613144.pdf
    • https://cdn.shopify.com/s/files/1/0435/3068/2519/files/analog_circuits_basics.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81667611697.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_off0000697d.bin
7fbaf9a2a624691a0f774ab03cff7456b890d16cb4482aa78b0183a57059a0a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697D 4888 bytes
font_01_sfnt_off00007a08.bin
5074afbc2a2acd2070c4c73d95ac1719b7cc01f1b843cfe28e2fd9980d8ea8f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A08 11288 bytes

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