Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adb495cef34f6c7…

MALICIOUS

PDF

40.8 KB Created: 2020-07-31 21:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21f2a160fec656414679f2c349bf9254 SHA-1: 6c746ca1c40e0f31c6d5677b6833a31689f839e1 SHA-256: 4adb495cef34f6c752d9c1ce43862136f0c759e421a48059bcb71c77e43931f3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the string "Clean master for pc" and the malicious URL, suggesting a lure to download potentially unwanted or malicious software. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a malicious link embedded within the PDF.

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=clean+master+for+pc
    • http://files.comanchemethodist.com/uploads/1/3/1/1/131163774/e9c5e3.pdf
    • http://files.brijuni.studio/uploads/1/3/0/7/130775556/zegadibe.pdf
    • http://files.alohadrycleaning.com/uploads/1/3/2/6/132682303/duwefezizin.pdf
    • http://files.kilrushns.ie/uploads/1/3/1/3/131379015/d0705.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/jefamimiso.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/81295541819.pdf
    • https://cdn.shopify.com/s/files/1/0437/1880/3610/files/40168079634.pdf
    • https://cdn.shopify.com/s/files/1/0431/9831/6707/files/bikaxuzijomezo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/66100472103.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0434/0826/1277/files/10160356708.pdf
    • https://cdn.shopify.com/s/files/1/0433/4908/2264/files/rijimowujuguzozidefi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7337/9231/files/naragosesoduwowan.pdf
    • https://cdn.shopify.com/s/files/1/0434/2883/9581/files/vonidodudovapil.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/29597635450.pdf
    • https://cdn.shopify.com/s/files/1/0434/3716/2657/files/46501344685.pdf
    • https://cdn.shopify.com/s/files/1/0430/7186/4993/files/49931168257.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_off00006468.bin
e7bf42ffc055c3abfcb5ed2bb91da5564a7243639fe0abab4549573711b732a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6468 5064 bytes
font_01_sfnt_off0000758a.bin
494d12b1210cbf0b86151700a5b614a32bc6086ad56132669e5414a83ba7c862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758A 9624 bytes

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