Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2281188c36bdbc…

MALICIOUS

PDF

35.5 KB Created: 2020-08-07 17:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47378b17adb1faa68624d59c96a58260 SHA-1: 83892495cd5ae1aa6b5df32d4aa86029d9d82530 SHA-256: 5b2281188c36bdbc4f023da5a14b7b73bec874619850ceca84294d1010966c74
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to link farms designed to manipulate search engine results. One prominent link, https://ttraff.ru/wb?keyword=radical%20love%20victory%20worship%20chords%20pdf, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document's structure and embedded links suggest an attempt to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

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/wb?keyword=radical%20love%20victory%20worship%20chords%20pdf
    • http://files.stjohnthebaptistdeanery.com/uploads/1/3/1/0/131070560/6a52328b.pdf
    • http://files.lynettelashes.com/uploads/1/3/1/1/131164097/xobolibivoz.pdf
    • http://files.cecilyeiferle.com/uploads/1/3/0/7/130776850/somakiwino.pdf
    • http://files.towncreekvision.com/uploads/1/3/0/7/130775357/feduku.pdf
    • http://files.insideemilyshead.com/uploads/1/3/1/3/131380493/desejalexakos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4508/4574/files/metokubakore.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/97216324016.pdf
    • https://cdn.shopify.com/s/files/1/0439/3720/2344/files/wakux.pdf
    • https://cdn.shopify.com/s/files/1/0435/9317/1103/files/validuwevulusedo.pdf
    • https://cdn.shopify.com/s/files/1/0436/1024/3229/files/63643226712.pdf
    • https://cdn.shopify.com/s/files/1/0429/2499/8819/files/22841176681.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/vedic_mathematics_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/0024/0024/files/surface_chemistry_notes_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1042/files/budegasuv.pdf
    • https://cdn.shopify.com/s/files/1/0439/8995/8814/files/63908164491.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98223768302.pdf
    • https://cdn.shopify.com/s/files/1/0434/1999/2222/files/94477311443.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_off00004daa.bin
a6deeb0f1e4a12c030ff4670dabe1cdb99a506dd896276ef5ae0067d9e089552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DAA 5504 bytes
font_01_sfnt_off00006080.bin
589398e9fe985c83df00e4b29bbac32928aecfc666119816e7c0b932fa36e361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6080 9556 bytes

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