Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebe4c15a9a9bf3a…

MALICIOUS

PDF

34.6 KB Created: 2020-08-28 16:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dd021638a0ab6c0a2d42e1a5a900f17 SHA-1: 6456107ceccb32af8509db5b9e0a5df16d27174a SHA-256: 4ebe4c15a9a9bf3aa4b8fc3ee81c52022a25336993886aab9cd3c3617ae215e5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded external links, including a redirector to the known malicious URL https://ttraff.com/pify?keyword=plantilla+para+escribir+recto. This suggests the document is designed to lead users to malicious content through a link farm. 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.com/pify?keyword=plantilla+para+escribir+recto
    • http://files.learndeveloplive.com/uploads/1/3/2/6/132682758/vegexijaxakibuselu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/69586811043.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5979/files/nuvogudukapezekiv.pdf
    • https://cdn.shopify.com/s/files/1/0459/0433/0906/files/30423849916.pdf
    • https://cdn.shopify.com/s/files/1/0440/0922/6398/files/53316141693.pdf
    • https://cdn.shopify.com/s/files/1/0436/0041/2835/files/centrifugal_casting_seminar_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77439678162.pdf
    • https://cdn.shopify.com/s/files/1/0432/1778/0896/files/rujagalejata.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/39815907080.pdf
    • https://cdn.shopify.com/s/files/1/0431/7125/0333/files/77415762932.pdf
    • https://cdn.shopify.com/s/files/1/0441/4147/8040/files/tutorial_adobe_premiere_pro_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0434/3031/4151/files/tracer_guide_heroes_of_the_storm.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_off00004ad9.bin
1b3380510154242ec10e2ee7f99b5cb2e49b78972921285209e67f209c5187e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD9 5068 bytes
font_01_sfnt_off00005c10.bin
0faed5fff1922a83bf718e07c49b381cfb7258f4f10fec0f04681a15dec6398f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C10 9944 bytes

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