Malicious PDF — malware analysis report

Static analysis result for SHA-256 7543a91e767aaea8…

MALICIOUS

PDF

43.3 KB Created: 2020-08-08 15:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25aad16190b79c8271cd966632e25ecb SHA-1: 132eae98632f2d11dda14f69dc65fc4117f51f83 SHA-256: 7543a91e767aaea863dfdb3e83de6ca684690c3ebba7ef748aa37446f3da3d0d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL and appears to be a lure for a book PDF. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL suggests an attempt to deliver a secondary payload or phish for credentials.

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=aubrey+marcus+book+pdf
    • http://wenone.freedomachine.com/uploads/1/3/1/3/131383444/b30929.pdf
    • http://files.losacres.com/uploads/1/3/1/3/131380651/jigumig_rofovurubo_buferan_jajife.pdf
    • http://files.thehillchristianfellowship.com/uploads/1/3/0/8/130814397/b21095.pdf
    • http://files.shareinhisloveministries.com/uploads/1/3/1/0/131070317/tafuzemapar-jitid.pdf
    • http://xewetil.craftedbyhand.shop/uploads/1/3/1/8/131856330/45fe368fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/courser_bee_honey.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/larabobed.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6774/files/baroque_architecture_sculpture_painting.pdf
    • https://cdn.shopify.com/s/files/1/0437/0658/1147/files/convert_de_a_word_online_gratis_y_rapido.pdf
    • https://cdn.shopify.com/s/files/1/0435/3854/6840/files/31228895522.pdf
    • https://cdn.shopify.com/s/files/1/0431/6577/8076/files/school_safety_agent_exams.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/14790269220.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6663/files/pefudubaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/gisigeninebura.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/sujomosugamorox.pdf
    • https://cdn.shopify.com/s/files/1/0429/3695/9139/files/guzax.pdf
    • https://cdn.shopify.com/s/files/1/0437/6133/6471/files/entrepreneurship_development_and_business_communication_agrimoon.pdf
    • https://cdn.shopify.com/s/files/1/0440/4091/3046/files/13030587109.pdf
    • https://cdn.shopify.com/s/files/1/0438/5495/4656/files/algorithms_and_data_structures_with_python.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b81.bin
83e8b62f28ff1eb466c9e2dce9b0d9e5d35e9ec7ff22ace7f98299c1cba36f0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B81 5564 bytes
font_01_sfnt_off00007e5b.bin
de4f51a5944dc2ee24decfc099b98a89ff7e650e6c343512c5a8ece638ba829c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5B 9896 bytes

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