Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7c664b432320d0…

MALICIOUS

PDF

52.0 KB Created: 2020-08-13 04:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11c052d011f9fddb53fea658484e8e91 SHA-1: 7399515e05fb55f517cdb36f423609b256f8d6a5 SHA-256: bf7c664b432320d0d70a16be4e27473f59a061184ef8610330d1cddff7e84925
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=bodmas+questions+worksheet+pdf. The document body, though heavily obfuscated, contains this URL and other Shopify links, indicating an attempt to lure users to potentially malicious sites. The ML classifier strongly supports the malicious verdict.

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=bodmas+questions+worksheet+pdf
    • http://files.bsocial.co.nz/uploads/1/3/0/7/130740196/4704211.pdf
    • http://files.mrpict.com/uploads/1/3/0/9/130969330/bibawujuxako_misazotejibepiw.pdf
    • http://files.airflowsheetmetal.com/uploads/1/3/1/0/131070212/6876563.pdf
    • http://files.railwayscenes.com/uploads/1/3/1/6/131636655/3320187.pdf
    • http://biwelujir.spanishgemma.co.uk/uploads/1/3/1/3/131384401/toxoxujivaneso_xiwasonezejed_vugasi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/xinap.pdf
    • https://cdn.shopify.com/s/files/1/0435/1062/8511/files/72843580338.pdf
    • https://cdn.shopify.com/s/files/1/0440/3652/2149/files/86681749985.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3841/files/femolezidigozuvuremevofag.pdf
    • https://cdn.shopify.com/s/files/1/0431/5657/0266/files/jugezadisixudex.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/receptor_de_androgenos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/1st_grade_math_worksheets_subtraction.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6632/files/collateral_beauty_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6568/files/1478173478.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/37566848181.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/zagamutawisakazab.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1927/files/41864713274.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d7f.bin
044975fb45f142da92c255a132b12a8250bdf86dd51e939e99784cd9eaaf80ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D7F 5464 bytes
font_01_sfnt_off00008ff5.bin
3fb030c2121bc46cd59a3c3f6b0bbbfcb86f9502d4cb198cc7cace84152abfc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF5 10636 bytes
font_02_sfnt_off0000b44e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB44E 4324 bytes

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