Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b4fc9418e057d4…

MALICIOUS

PDF

39.3 KB Created: 2020-08-20 21:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c321fb3f838cd3b47fd95921085a3545 SHA-1: 741a24eafdef291bb9c23480479bf4de8f55ab0b SHA-256: 98b4fc9418e057d4780aae1bf839f9587d899d00d2bf7377af87c62a3a18abe8
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The document body and embedded artifacts are heavily obfuscated, but the primary malicious indicator is the redirector URL, which likely leads to a phishing or malware distribution site. The presence of a link farm suggests an attempt to game search engine results for broader distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=bored+button+gold+apkpure
    • http://files.chabadwomensprograms.com/uploads/1/3/1/8/131860060/xosiko.pdf
    • http://vunum.meadowandfawn.com/uploads/1/3/2/3/132303374/4413446.pdf
    • http://karevoriw.vaporstopgreenville.com/uploads/1/3/2/6/132682905/5497288b32e78.pdf
    • https://cdn.shopify.com/s/files/1/0435/2878/1988/files/terraria_borderless_window.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/86085882824.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/garokilaxavenosomewin.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/82328157933.pdf
    • https://cdn.shopify.com/s/files/1/0437/0182/9797/files/80005840536.pdf
    • https://cdn.shopify.com/s/files/1/0451/9283/9317/files/chs_entrance_exam_paper_for_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0449/4855/3887/files/biochemistry_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zizamazigunonafimav.pdf
    • https://cdn.shopify.com/s/files/1/0437/1454/3771/files/66467714542.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000075a6.bin
201b3375ff1932eea6fc38ff5827e5e0d17c549dd222964f50d5125a676020de		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x75A6 17688 bytes
font_00_sfnt_off00004199.bin
be2cbc75a474a58026ab944e994bfa736fc2308f304c6eae16765eb93615efa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4199 5204 bytes
font_01_sfnt_off00005357.bin
1e7f7c1d16dbef0574a41a8665963912c71e803fb58da3883773a3db69b2192d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5357 9996 bytes

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