Malicious PDF — malware analysis report

Static analysis result for SHA-256 25df81489e127472…

MALICIOUS

PDF

43.1 KB Created: 2020-09-17 13:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bc9c3f1b85d8f38aa87f6b2db0b9f18 SHA-1: 2a60177518fe0ce8a0ca3ab31e355ae7048d36b2 SHA-256: 25df81489e1274723500a78866fb672c9f4704492727d4282158c0d99ff14b06
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be a lure for hacking game cheats. This suggests the PDF is designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this 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.me/wix?keyword=how+to+hack+world+conqueror+3+with+game+guardian
    • http://files.luigicurini.com/uploads/1/3/1/4/131407647/13831e81ed30ec1.pdf
    • http://bipolenur.thepavlich.com/uploads/1/3/1/3/131383737/6516883.pdf
    • http://vuxeko.ikibydesign.com/uploads/1/3/1/3/131380086/wiperibawune-begufoxuxe-vagemune-razap.pdf
    • http://gorexore.citysunholdings.com/uploads/1/3/1/4/131453036/duxikonibegiwan.pdf
    • http://febepa.justlikehomedaycares.com/uploads/1/3/1/6/131607662/fujagomafemalepodudi.pdf
    • https://7be3e62c-5a93-4b21-9b68-c93582bbf1ea.filesusr.com/ugd/665c20_04ddeb6392624c94956d1ac683d9dee6.pdf?index=true
    • https://3e67fa73-9986-4453-91f7-1e7856c80dbe.filesusr.com/ugd/54fa57_3ba43ad47a7f4220a4521a7aefd9ed56.pdf?index=true
    • https://fbd60d9b-92d6-4bcc-8fa3-671217aee289.filesusr.com/ugd/c0fca2_37df77d0919245bf90ce36cf1d8e6fdf.pdf?index=true
    • https://aff6c360-7f17-4287-b0dd-03aff4fe7f22.filesusr.com/ugd/359e64_d647e09d6a1a446998f083f860e53bd3.pdf?index=true
    • https://366c6324-bc10-4ee4-9cc3-8ab4b7c340d2.filesusr.com/ugd/704566_b948cb6eab0745a8948d564753339f68.pdf?index=true
    • https://6089b8a4-d8b0-45fe-93c3-b06b56cecaeb.filesusr.com/ugd/5aec95_4ed5639f27824fd98094a4330f01e31d.pdf?index=true
    • https://77b5fa83-b79d-4576-ad7c-ef30581751be.filesusr.com/ugd/de3d83_52b74c905bf246f98d89c5202869a37c.pdf?index=true
    • https://33f07765-ae8f-4e98-b02d-1c4aeb703797.filesusr.com/ugd/6e2da7_9999ea9799f74b26bd465cc65ca4fe91.pdf?index=true
    • https://b60c8034-a4cd-4fd5-85a2-c83c1f813fe0.filesusr.com/ugd/6c032c_d9ba95b3b1c248dbbafee0df1a1bb934.pdf?index=true
    • https://b64d6615-de70-4d3b-9d84-7781458febe1.filesusr.com/ugd/f55bec_339814f5a39843e287f1603702fc46cf.pdf?index=true
    • 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/
    • https://b60c8034-a4cd-4fd5-85a2-c83c1f813fe0.filesusr.com/ugd/6c032c_d9ba95b3b1c248dbbafee0df1a1bb934.pdf?index=tru

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006925.bin
b87d58166c1908c0d9812b6ff01dc2f65c3eb5a11aab3079aa0b3c9d4e6c7793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6925 5584 bytes
font_01_sfnt_off00007c03.bin
09409f97aa2f73e889ecf0ef194805e1d714dbd352b7e9ca3e11db6715b67d01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C03 10392 bytes

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