Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba46c0d6a4cfddb…

MALICIOUS

PDF

48.5 KB Created: 2020-07-30 23:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5bb3127ff990440301ffc7accd76adc SHA-1: a6b39607e0f7f3f987d80f63b41df863d2042708 SHA-256: cba46c0d6a4cfddb65ac6b4a76daa2a0873e2ffee1d997d5631e12f7dd52be74
152 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Cambridge English Grammar'. The presence of a link farm and the ML classifier's high confidence indicate malicious intent, likely to redirect users to a malicious site for further exploitation or phishing.

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=cambridge+english+grammar+in+use+essential+supplementary+exercises+pdf
    • http://files.tinytailsk-9rescue.com/uploads/1/3/0/9/130969818/gegaxeboruwegexumob.pdf
    • http://files.somonaukfire.org/uploads/1/3/2/6/132695329/misisiba.pdf
    • http://files.nwgyfl.club/uploads/1/3/1/4/131483772/mowapeluz.pdf
    • http://files.theapostolicchurch-newlife.org/uploads/1/3/1/8/131871621/d4a714.pdf
    • http://files.keithdeininger.com/uploads/1/3/0/7/130739509/9505567.pdf
    • http://files.tinytailsk-9rescu
    • https://cdn.shopify.com/s/files/1/0440/3570/2949/files/fobefipebadaviwenof.pdf
    • https://cdn.shopify.com/s/files/1/0433/4904/9499/files/18137382977.pdf
    • https://cdn.shopify.com/s/files/1/0428/2207/4534/files/rowuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/3243/5093/files/49600910443.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8482/files/dasof.pdf
    • https://cdn.shopify.com/s/files/1/0429/9436/8663/files/10705525266.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/lobamuna.pdf
    • https://cdn.shopify.com/s/files/1/0429/9715/3943/files/66698220471.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/godanozuvuxefojub.pdf
    • https://cdn.shopify.com/s/files/1/0431/3183/0421/files/zedobudovesaregemaso.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
font_00_sfnt_off00006957.bin
eb65a924cba13946cb10175aa45a7cf6ade8500f2920d74f2330b480e932f321		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6957 5676 bytes
font_01_sfnt_off00007c83.bin
5bca8a2f720720ee24e8c9fb6b8708f7aa96daa050979898af17c7325477185c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C83 10088 bytes
font_02_sfnt_off00009f2e.bin
5d72d630640305d452d914085fd6c65e0d8125198bed8028c282d44fd0327be8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F2E 16068 bytes

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