Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3ec8c5208b0d23…

MALICIOUS

PDF

39.7 KB Created: 2020-08-23 22:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed5f2b978618fb463cfe7b1aed206fd8 SHA-1: 4fb82c991f5f863ce199c02b8d7575d595e0a5cb SHA-256: df3ec8c5208b0d23de5f705c2450a0cb0552a175217d4bf42bf5c055babe3f5c
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 of which point to domains associated with link farms and redirectors. The primary malicious link, 'https://ttraff.cc/pify?keyword=bluestone+alley+piano+sheet+with+letters', is designed to trick users into downloading content. The ML classifier strongly indicated maliciousness, supporting the presence of malicious redirector links.

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.cc/pify?keyword=bluestone+alley+piano+sheet+with+letters
    • http://jutufe.thebluenoteringos.com/uploads/1/3/1/0/131070382/8606725.pdf
    • http://wofurol.wastedtalentdesign.com/uploads/1/3/2/7/132711947/lofitedaruwutavumuzo.pdf
    • http://voloj.guidedlondontours.com/uploads/1/3/0/9/130968931/pekuxibafe-rokewibiwizelo.pdf
    • http://xaxar.loufitness.co.uk/uploads/1/3/1/1/131164250/4570e1.pdf
    • http://files.gordenstaxservice.com/uploads/1/3/1/3/131381109/namadasibodazajuzo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0202/files/75231653905.pdf
    • https://cdn.shopify.com/s/files/1/0428/8321/9619/files/zukezolefimunofewizitanus.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/77504942295.pdf
    • https://cdn.shopify.com/s/files/1/0434/1157/0838/files/voxidasumajev.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/t_sql_tutorial_point.pdf
    • https://cdn.shopify.com/s/files/1/0439/0033/8331/files/wenufolariduxugowijeji.pdf
    • https://cdn.shopify.com/s/files/1/0429/1349/7247/files/bible_quiz_genesis_1_50_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/31932512680.pdf
    • https://cdn.shopify.com/s/files/1/0433/8194/8567/files/povunigirababavinev.pdf
    • https://cdn.shopify.com/s/files/1/0439/4660/6760/files/income_tax_slab_for_assessment_year_2020_19.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_off00004d9e.bin
35763d3a1f366daa9bc2949ca4764c01a6b643f3a000a14864cc5d83f7e6f8b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D9E 4584 bytes
font_01_sfnt_off00005d9c.bin
da363bf1714383716571e2ddc45a058bab0a3de4b7627ab6079bc1d0a9e2034e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9C 5152 bytes
font_02_sfnt_off00006f30.bin
51bd4461757e224c68bec100f53051fba02f58a20ca0c441b5d0141089de76fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F30 10072 bytes

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