Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1dc95bdcc99a87…

MALICIOUS

PDF

39.3 KB Created: 2020-08-14 12:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c764de8e44310a07573099c3b5e65d17 SHA-1: cbd9ad35e45250c000c2c5d19873bccc1ef92389 SHA-256: 0f1dc95bdcc99a87d2583f4b0bedf4a8cef60622e019f5cd210afa2bcf80b3b9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm designed for SEO manipulation. One prominent URL, https://ttraff.com/wb?keyword=human%20anatomy%20and%20physiology%20lab%20manual%20cat%20version, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking malicious links under the guise of educational material. The ML classifier strongly indicates maliciousness.

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/wb?keyword=human%20anatomy%20and%20physiology%20lab%20manual%20cat%20version
    • http://files.viriyachot.com/uploads/1/3/1/4/131437457/2449394.pdf
    • http://sogawav.notestotheunderground.com/uploads/1/3/1/4/131437812/rulid-jivosibogulanez.pdf
    • http://files.greenhopefinearts.org/uploads/1/3/0/7/130775647/rutogafilekujar_gagogigopoda_kaxipo_welinozeme.pdf
    • http://files.caitlintrude.com/uploads/1/3/1/6/131636890/vesifakisu_dolitoxotujunun.pdf
    • http://files.getbrandywinevalleybread.com/uploads/1/3/1/6/131636792/3868589.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7623/9014/files/fetiwe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5636/4709/files/steam_find_friends.pdf
    • https://cdn.shopify.com/s/files/1/0436/1771/4334/files/emotional_intelligence_daniel_goleman_summary.pdf
    • https://cdn.shopify.com/s/files/1/0435/7583/6840/files/63559350259.pdf
    • https://cdn.shopify.com/s/files/1/0430/5082/7929/files/dabami.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2321/files/55160694460.pdf
    • https://cdn.shopify.com/s/files/1/0428/9652/3423/files/neon_trees_animal.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/rofif.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6721/files/vipuvevesoxemotaxaribe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7296/9109/files/select_max_sql.pdf
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/nerukinovavul.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/notibozuxuwoberof.pdf
    • https://cdn.shopify.com/s/files/1/0438/6160/6565/files/vuzebidabatu.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_off000058e4.bin
e472ca1f1fa813afd08c57a1a446186728b38ee3615d3c4884214cf8c5913407		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58E4 5748 bytes
font_01_sfnt_off00006c44.bin
a8e3fd14f2fda136716ad5376dc9b01058fd00663d024388ebb17ca937ffd540		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C44 10348 bytes

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