Malicious PDF — malware analysis report

Static analysis result for SHA-256 0516e2e8e58db242…

MALICIOUS

PDF

44.0 KB Created: 2020-08-16 23:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e20389ae6ae2c2c7b3513f6145dd6e61 SHA-1: 23402f29bd081c4c8d0eb16f25bc9f493ce24b53 SHA-256: 0516e2e8e58db242f082cc0e4bb4369769d9adfad2cd734a3263d03ed80a1074
154 Risk Score

Malware Insights

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

The PDF contains embedded links designed to redirect users to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a 'worksheet answer key' to lure victims. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation or to distribute the malicious payload. No scripts were extracted, but the presence of malicious redirector links is a strong indicator of a phishing or malware distribution 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.ru/pify?keyword=crash+course+us+history+5+worksheet+answers
    • http://files.edwardschapel.org/uploads/1/3/1/4/131453350/gojokata-podukesoxe.pdf
    • http://files.sirsdigitalcommerce.com/uploads/1/3/0/7/130776200/popegawigegonijav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/fazagidonezakaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/51176422235.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2156/files/xowopakalozomubekifado.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6615/files/calendar_week_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7205/files/31512624791.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niroduwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0681/1560/files/flaticon_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/kejenulotalu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/86455385296.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5018/files/28507095304.pdf
    • https://cdn.shopify.com/s/files/1/0429/7896/7703/files/bifigon.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4031/files/69365470972.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/denofenabokipapodemuviz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4872/9766/files/animal_anatomy_for_sculptors.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/zoxopopafi.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_off00006ed7.bin
eb1e843efd10fc1da2683fad830dfadfc1f4894becba42a4e0865ec9ccc47dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED7 5144 bytes
font_01_sfnt_off00008068.bin
d34f1b9582b0af9d5b1fbeb17bb3179c2ae6002fc3f7e1868155925b4529c797		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8068 10024 bytes

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