Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73f65d0bacc4c03…

MALICIOUS

PDF

63.7 KB Created: 2020-08-31 06:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6b20956a3fdb517540187e2a8b47633 SHA-1: e0a52505994d2e5835e4687a16ab6ab36998e970 SHA-256: a73f65d0bacc4c03d61aec94b31945e523b3ec1f312643991e10cdb76772f004
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'Skoda amundsen navigation manual' and a URL pointing to a redirector. This suggests a phishing or social engineering attack aiming to redirect users to malicious content.

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/wix?keyword=skoda+amundsen+navigation+manual
    • https://cdn.shopify.com/s/files/1/0432/1129/2827/files/causative_form_have_get_something_done.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/easy_english_basic_grammar_and_usage.pdf
    • https://cdn.shopify.com/s/files/1/0434/5102/3510/files/86654975678.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7498/files/venereji.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/70279105676.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2533/files/tazixap.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/62968513326.pdf
    • https://cdn.shopify.com/s/files/1/0445/4963/6255/files/xujisubaxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/33306634711.pdf
    • https://cdn.shopify.com/s/files/1/0452/5296/8609/files/802387878.pdf
    • https://cdn.shopify.com/s/files/1/0454/0166/9800/files/oxford_dictionary_english_etymology.pdf
    • https://cdn.shopify.com/s/files/1/0431/6558/1469/files/42967923215.pdf
    • https://cdn.shopify.com/s/files/1/0433/7762/3194/files/best_hollywood_movies_site_name.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/22325566289.pdf
    • https://cdn.shopify.com/s/files/1/0462/4475/7664/files/bestwap._in_movie_2018_bollywood.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008df2.bin
e8a125bbfb913c30ccea69f36c90a656ccdbd63e78b62a74e74cad9306919991		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF2 5568 bytes
font_01_sfnt_off0000a0a2.bin
0fa878f167b7c8d51194710b3d69898b4b27495fd8f745bdfd697415298952a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0A2 5156 bytes
font_02_sfnt_off0000b21f.bin
a3ab35f52b78f3adfdfbdd4c577a2800fe3489d1aa5aca95bfeaed106d282f3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB21F 15516 bytes
font_03_sfnt_off0000e1d1.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 4324 bytes

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