Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8733dd51e5d3d0…

MALICIOUS

PDF

40.4 KB Created: 2020-08-31 08:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f864983fa68f8832b03acdb96580254 SHA-1: a56f1168d5fa874cd9b69f1a58dde9ba0990c083 SHA-256: 6e8733dd51e5d3d0969ed6e5733b6aa90f61306dba08b4a2e96f548b03cc3afa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a redirector link to a malicious domain. Another heuristic identified it as a PDF link farm, suggesting a tactic to distribute malicious content or phish users. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=burhan+al+chalabi
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0375/6196/files/48987468862.pdf
    • https://cdn.shopify.com/s/files/1/0436/5520/0918/files/82276068933.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/garmin_nuvi_1350_map_update.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/jomurepababudos.pdf
    • https://cdn.shopify.com/s/files/1/0437/7922/7810/files/57288895880.pdf
    • https://cdn.shopify.com/s/files/1/0445/6205/5332/files/anticipatory_bail_in_up_notification.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/31750033187.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/nuwezipiraxanetunazinemi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2683/1784/files/concatenate_multiple_excel_files_into_one_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/4201/2327/files/gathering_for_gardner.pdf
    • https://cdn.shopify.com/s/files/1/0428/4101/4438/files/gadad.pdf
    • https://cdn.shopify.com/s/files/1/0434/8998/4678/files/statistical_models_in_engineering_hahn_shapiro.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_3653eaadd9964fcfad56d677ce84f417.pdf
    • https://static.usrfiles.com/ugd/83b1b3_bd9dcb65a8f04e31a4e82c4313da2075.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006261.bin
684e2f34c80b41656df78f2d658d430ab6fde86942a9e47635ddd013a554fb6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6261 4900 bytes
font_01_sfnt_off000072f6.bin
a356183c6e312afe5d3184ad36bc0949cb3f7ebd830c72ee1f6ff2454921c666
pdf-font-stream PDF embedded font (sfnt) at offset 0x72F6 9992 bytes