Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e7ffaf29f7a485…

MALICIOUS

PDF

43.2 KB Created: 2020-08-06 18:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e285363c7cc71b508fbe2ae27c056804 SHA-1: 45bd1ae9c39732802e36b4f477dbbcb4724581c8 SHA-256: 81e7ffaf29f7a485215e41882cbf55277a7c2eb6425c74f9aeb107c5db134d9c
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector, which is a strong indicator of malicious intent, likely to lead the user to a phishing or malware download site. The document body and heuristics suggest a lure related to accounting interview questions, aiming to trick users into clicking the malicious link. While no scripts were explicitly extracted, the PDF structure and embedded links are sufficient to infer a malicious redirection attempt.

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=basic+accounting+interview+questions+and+answers+pdf+download
    • http://files.azwatersolutions.com/uploads/1/3/2/6/132681352/5e3982aa0d4.pdf
    • http://files.techconnectwest.net/uploads/1/3/1/6/131606876/kiwoxubataz-zuxuli.pdf
    • http://files.nickbridwellwriter.com/uploads/1/3/1/8/131856234/buxojapimo.pdf
    • http://files.clarelouiseroberts.com/uploads/1/3/0/7/130740624/pujawaputi_wutam_tuvazan_jamatokegodura.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/all_nighter_wood_stove.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/edward_snowden_book_permanent_record.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6408/files/vepuzokimi.pdf
    • https://cdn.shopify.com/s/files/1/0436/5172/7513/files/xejasurer.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/jemuduru.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/lavumulokozoxazuwekefiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0029/9683/files/tigufezep.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5534/files/54154928565.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/witikidorubopexozuwuka.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3939/files/84472958311.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/lolatijuzikifu.pdf
    • https://cdn.shopify.com/s/files/1/0449/9347/8814/files/spatial_reasoning_test_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6977/files/picsart_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/nobuvufisazibasutajalibub.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_off00006b72.bin
02c52b0496151689e7b9f7da83783256492e629cfc7bc4fbd984c26831ff6c00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B72 5652 bytes
font_01_sfnt_off00007ec6.bin
6ea76186b534e7d71d3c592cbbe5333ba8d549ae07b7b447a0430682d44ed7f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC6 9504 bytes

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