Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3477614ab49b3e…

MALICIOUS

PDF

42.3 KB Created: 2020-08-03 15:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85fbea53c3fe0fe0ffddc78c04f439a2 SHA-1: 665b7a737b741f7b5827995e078f98f52b2f95e5 SHA-256: 0f3477614ab49b3e722ced358916274e6bcbe9e3506b0a2a1391d5465bdb2340
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'English dictionary book download pdf' and the malicious URL, suggesting a lure to download potentially harmful content. No scripts were extracted, but the presence of malicious links is a strong indicator of an attack.

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=english+dictionary+book+download+pdf
    • http://files.bubbleytrinkets.com/uploads/1/3/0/9/130969220/4391253.pdf
    • http://files.montrealmusiciansexchange.com/uploads/1/3/1/6/131636914/nepopulagibubumuziv.pdf
    • http://files.haafa.org/uploads/1/3/0/7/130776509/602615.pdf
    • http://files.tremaineh.com/uploads/1/3/0/8/130814714/buzevonur-firamekaganitig-pewiraza-vobiro.pdf
    • http://files.atlantasouthcomiccons.com/uploads/1/3/1/4/131437693/9982724.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/6261473316.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lejozusuxawunulimedobina.pdf
    • https://cdn.shopify.com/s/files/1/0441/3816/8472/files/11162480107.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2892/files/14214912628.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/pobiji.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8765/files/49554486160.pdf
    • https://cdn.shopify.com/s/files/1/0440/1886/0190/files/75617566319.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5708/files/jitawemazipadesimunumuxus.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/suniguwi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/73977177224.pdf
    • https://cdn.shopify.com/s/files/1/0434/3670/3900/files/hexxit_server_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/67822386672.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80170273674.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_off00006659.bin
a44381652c4ae08cad9c028b9ee23bb1d2381e1449f670b39c78d8974ad9ed8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6659 5772 bytes
font_01_sfnt_off00007a1b.bin
7cb0095087d0282b637d3cdaa9960acfed27d00df60269661dfa6ef7efbf071f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1B 10128 bytes

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