Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a64e1065dc3a891…

MALICIOUS

PDF

49.2 KB Created: 2020-08-11 00:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e801b4ba3add9573808110b25f1dc549 SHA-1: 4031e4f43cc0a77ce6cd2846b39fba0ce5b87385 SHA-256: 4a64e1065dc3a8919b3af869c8da83c4212a21cde666879d00ab967e783d83bd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.cc/pify?keyword=baba+yetu+partition+chorale+pdf, which is likely used to lure the user to a malicious site. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a large number of URLs, suggesting a link farm or redirection attempt.

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.cc/pify?keyword=baba+yetu+partition+chorale+pdf
    • http://files.kimbangerter.com/uploads/1/3/0/8/130814050/4995460.pdf
    • http://dadeta.mirembegirlsvocationalcentre.com/uploads/1/3/1/6/131606490/nabowado.pdf
    • http://files.eastendspecialplayers.org/uploads/1/3/1/6/131607043/tinuja_gofuxod_velil_naxomajinu.pdf
    • http://files.absolute.technology/uploads/1/3/0/9/130969061/b6b51224baa.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/fosilorilapiwofakawokate.pdf
    • https://cdn.shopify.com/s/files/1/0434/4378/1792/files/jefig.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/59592494485.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/88241575986.pdf
    • https://cdn.shopify.com/s/files/1/0439/2815/8363/files/23547549002.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7174/files/connected_components_workbench_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/9639/1323/files/muxuburuxef.pdf
    • https://cdn.shopify.com/s/files/1/0441/1306/8184/files/wojemexitemexoguvupefol.pdf
    • https://cdn.shopify.com/s/files/1/0440/7237/0326/files/68353156918.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/34273599149.pdf
    • https://cdn.shopify.com/s/files/1/0430/2523/6121/files/9713427839.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/gixamosigi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7669/7760/files/digital_logic_circuits.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_off0000825e.bin
e5c5dbd8509347793f17573842572addc74e1b0636be80336bfd687830c38ede		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825E 5356 bytes
font_01_sfnt_off0000948b.bin
649641f9817764dad82cca116e1b5500ee0093c6d4124c52cb372aed040f6f27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x948B 10420 bytes

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