Malicious PDF — malware analysis report

Static analysis result for SHA-256 960a15f28d33eacb…

MALICIOUS

PDF

37.0 KB Created: 2020-09-07 18:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa2777206a9a029174f51893d96cb6a6 SHA-1: 823002e0fe33f16da84733ceea2f719a6724249f SHA-256: 960a15f28d33eacb4f6213bf261fd0b2eb871c14e64fbbf9eb6432306719135a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.me'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous links, many pointing to Shopify domains. The document body, though partially corrupted, contains the 'eylf reference guide' string and the malicious URL, suggesting a lure to a potentially harmful site. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=eylf+reference+guide
    • https://cdn.shopify.com/s/files/1/0431/3012/6496/files/72044198417.pdf
    • https://cdn.shopify.com/s/files/1/0445/3584/0932/files/identification_of_functional_groups_in_organic_compounds_practical.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/36992811206.pdf
    • https://cdn.shopify.com/s/files/1/0436/0024/8995/files/2124851139.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/xalebukitupovilikowopi.pdf
    • https://static.usrfiles.com/ugd/b916f4_e1b1594ee322481a9ffe744e79557a44.pdf
    • https://static.usrfiles.com/ugd/b8c837_20d82a16a88e4f5791e57b7def2b1a52.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e88968d59744da3964ca22d0488171b.pdf
    • https://static.usrfiles.com/ugd/b8c837_66a6cfa2ee224b98bf7f8cd17310c0b4.pdf
    • https://cdn.shopify.com/s/files/1/0435/6279/5167/files/cara_buat_cv_di_android.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/lemijojon.pdf
    • https://cdn.shopify.com/s/files/1/0428/2646/5436/files/95839350306.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/kexolexerasaler.pdf
    • https://cdn.shopify.com/s/files/1/0443/1613/1484/files/mixed_modal_verbs_exercises_advanced.pdf
    • https://static.usrfiles.com/ugd/2e16aa_ed01fc00bba349caa0a0c412ee4fa6ed.pdf
    • https://static.usrfiles.com/ugd/3e9e83_dcc9de9a285940bdafc593d4b8041b97.pdf
    • https://static.usrfiles.com/ugd/733c1f_bcf7dc3a55e24ca5b2021fbafabca24b.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_off000048eb.bin
216e59a26ac88f72a0c19bacba1ddd9d038f4e2f4efcbc43e56ecf0108f8e7c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48EB 4552 bytes
font_01_sfnt_off00005861.bin
06396c690845f4f69fa18fc930cd71754de9db9f3f74df20fbbe74dbd013acdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5861 9592 bytes
font_02_sfnt_off00007914.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7914 4324 bytes

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