Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca1c729453ab925…

MALICIOUS

PDF

50.4 KB Created: 2020-08-09 02:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecd5a9f43eb194ea5df5989945f9378b SHA-1: 6591abfb10506cc8622cb122a725ad7e5deff342 SHA-256: cca1c729453ab925a220157750794c234d1225f1f7a79c529165cc85b781953f
154 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 pointing to external PDF files, characteristic of a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which likely serves as the initial stage for delivering further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=similarities+between+andragogy+and+pedagogy+pdf
    • http://falekonu.keatonshapiro.com/uploads/1/3/1/4/131482995/3570136.pdf
    • http://wodomavep.vibrationalinstitute.com/uploads/1/3/0/7/130776485/3311677.pdf
    • http://files.teddybarbier.com/uploads/1/3/2/6/132680933/zudikebemuw-redotogi-kepuramov-lomusofoxijevap.pdf
    • http://files.jbartdesign67.com/uploads/1/3/1/6/131607029/buvazo.pdf
    • http://files.gammaxiques.org/uploads/1/3/2/7/132740260/zunuwosasob_demekat_kikixabanafi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4818/1666/files/xagudawudupojamejiwifila.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/53085815907.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/blockchain_revolution_alex_tapscott.pdf
    • https://cdn.shopify.com/s/files/1/0432/5448/1054/files/13128314535.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/23336209574.pdf
    • https://cdn.shopify.com/s/files/1/0433/9305/6933/files/event_name_generator.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4014/files/rpsc_stenographer_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6003/files/1908694313.pdf
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/sutijarobujamonug.pdf
    • https://cdn.shopify.com/s/files/1/0432/4648/5672/files/lakuxaka.pdf
    • https://cdn.shopify.com/s/files/1/0430/7602/6522/files/fofiwitikatagalesido.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062b0.bin
110a2d2dfeae1cae88bc30c1ec168cd0b7a032cb492b762ae767a815d34ebd18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B0 5588 bytes
font_01_sfnt_off00007597.bin
712f7515b33029491231228c5acc3046a0d2759c7b6d88ecf4d4308527ce42e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7597 10272 bytes
font_02_sfnt_off000098db.bin
e7273338525a866f49bd556f13a0e46ce1e8513f85f175d9d987aa1f8b89adb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98DB 16068 bytes
font_03_sfnt_off0000ad7f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7F 4324 bytes

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