Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec30d13136ae7c6…

MALICIOUS

PDF

55.8 KB Created: 2020-08-17 12:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3a2f1156eef9d743d423940f991e5ec SHA-1: 6b63ed377b96cadd9f1c8a1f7b0767d57f304b2d SHA-256: bec30d13136ae7c61e5bb3236d30d05048b0c7e65b54053fa7ce66733d44069b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to known malicious infrastructure, disguised with text related to 'Indigo airlines latest information'. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the lure text and a URL pointing to a redirector. The PDF also contains a large number of embedded links, many of which point to Shopify domains, likely as part of a link farm to improve search engine ranking for malicious content.

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=indigo+airlines+latest+information
    • http://files.cleanmeat-hoax.com/uploads/1/3/2/7/132740595/8518191.pdf
    • http://files.camplongfisheries.com/uploads/1/3/2/6/132695636/a84a4edd7a8.pdf
    • http://pekiwiga.trchurchofchristcourses.com/uploads/1/3/1/1/131164312/dunoxutu-vivigugokireko-temexenuwutir-mowamibikow.pdf
    • https://cdn.shopify.com/s/files/1/0431/3769/5906/files/fill_drupal.pdf
    • https://cdn.shopify.com/s/files/1/0434/0649/1797/files/87557451436.pdf
    • https://cdn.shopify.com/s/files/1/0438/4371/5229/files/98123214573.pdf
    • https://cdn.shopify.com/s/files/1/0437/0412/3557/files/agustin_etchebarne_libros.pdf
    • https://cdn.shopify.com/s/files/1/0433/6094/4296/files/balance_of_trade_definition.pdf
    • https://cdn.shopify.com/s/files/1/0438/5875/5749/files/nigimawibazori.pdf
    • https://cdn.shopify.com/s/files/1/0428/5507/1900/files/sqlite_data_starter_packs.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/jobiwub.pdf
    • https://cdn.shopify.com/s/files/1/0429/3695/9139/files/67361617104.pdf
    • https://cdn.shopify.com/s/files/1/0435/6122/2307/files/eclipse_ide_for_java_ee_developers_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/35056932432.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_off00008788.bin
0aae60acb9ae0853e3a8eb204799bd399905558eab9e62707246e0472827fe87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8788 5164 bytes
font_01_sfnt_off000098fc.bin
6faa6193b46c14e3bd5502933c1bdb1cd172486cf5112bd1f97a1bdea159f22a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98FC 10444 bytes
font_02_sfnt_off0000bce6.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE6 16164 bytes

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