Malicious PDF — malware analysis report

Static analysis result for SHA-256 a785bf298dcf5ae5…

MALICIOUS

PDF

34.5 KB Created: 2020-08-31 02:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b72d88724f2ec5ca17b078ade7a6c4be SHA-1: 5fa8ce1cfe928d6372336761284ad18ce642ba44 SHA-256: a785bf298dcf5ae5700a9f7df29701aed87c6cb8c51e561fa10348a4e2c6149d
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, disguised with a seemingly educational keyword, likely leads to a malicious site. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many hosted on Shopify. The ML classifier strongly indicates maliciousness.

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.ru/wix?keyword=solving+one+step+equations+graphic+organizer+pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/degikexug.pdf
    • https://cdn.shopify.com/s/files/1/0433/5976/4634/files/92341729420.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5457/files/igi_jewelry_report_check.pdf
    • https://cdn.shopify.com/s/files/1/0460/0718/9671/files/fallout_76_nightstalker.pdf
    • https://cdn.shopify.com/s/files/1/0435/6256/5795/files/synchronisatie_agenda_outlook_android.pdf
    • https://static.usrfiles.com/ugd/4dd980_beb16c9db6e3457796ec98d2493d6b1d.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/31240644636.pdf
    • https://cdn.shopify.com/s/files/1/0432/4127/5547/files/26158758521.pdf
    • https://cdn.shopify.com/s/files/1/0437/2519/3368/files/bedingte_formatierung_wenn_wort_dann_farbe.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/atap_genting_atap_rumbia.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/traxxas_slash_2wd_parts_diagram.pdf
    • https://static.usrfiles.com/ugd/9b33c5_f368ec8b7d7549ffbdac50a0a7ca0b01.pdf
    • https://static.usrfiles.com/ugd/b8c837_e02019584a954817afa1533844b0729b.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb8b9eb68ce94939b450ad178305bbfb.pdf
    • https://static.usrfiles.com/ugd/b8c837_95797f8b807143c5af5fd41e7d5949e8.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_off000047c7.bin
e78116a7ce2e61c45db8f6d55ff40f6e43800b6e4d7a4d44eb22db62b2f4a669		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47C7 5756 bytes
font_01_sfnt_off00005b61.bin
0540b41170a469ce6d57111631ad1f26798f4acccb26656b16efdc3e69d2db9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B61 9320 bytes

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