Malicious PDF — malware analysis report

Static analysis result for SHA-256 662ff6d6cd97da1a…

MALICIOUS

PDF

46.8 KB Created: 2020-08-09 03:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c46f7b98328325cc59c83f29467345d6 SHA-1: a1d1fe60bbe6408d96fc198e5b5a89335c2289ac SHA-256: 662ff6d6cd97da1a1fbab09b37c69dbf847e08fe64b3d7f7b5a1deecea75a576
194 Risk Score

Malware Insights

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

This PDF document is identified as malicious due to its extensive use of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that is also flagged as malicious. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=malformaciones+congenitas+del+recien+nacido+pdf
    • http://files.coachdavidhenley.com/uploads/1/3/2/3/132303150/7319031.pdf
    • http://files.ouwpc.org/uploads/1/3/0/7/130738593/fafesuwil.pdf
    • http://files.myindietrail.com/uploads/1/3/1/3/131398125/5756474.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/71833422794.pdf
    • https://cdn.shopify.com/s/files/1/0448/8301/7895/files/15207334300.pdf
    • https://cdn.shopify.com/s/files/1/0429/8145/8069/files/bapatiretob.pdf
    • https://cdn.shopify.com/s/files/1/0434/1353/6925/files/20083816442.pdf
    • https://cdn.shopify.com/s/files/1/0431/3278/0695/files/calendario_2020_con_semanas_numeradas.pdf
    • https://cdn.shopify.com/s/files/1/0435/5060/5461/files/59827271058.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/awards_and_honors_gk.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6285/files/saxileforiruradisigito.pdf
    • https://cdn.shopify.com/s/files/1/0446/6976/3747/files/profit_and_loss_appropriation_account_example.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/funuwumubozanogukaji.pdf
    • https://cdn.shopify.com/s/files/1/0433/3066/6651/files/jovoforenatukebukoxuwa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0821/9560/files/dolores_cacuango.pdf
    • https://cdn.shopify.com/s/files/1/0432/1912/4382/files/90522179045.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_off0000749d.bin
43be831804b216a56ad1da16985eb53425b1c9d4df115d3fcced070a3c271c08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749D 5480 bytes
font_01_sfnt_off0000873a.bin
929875ea3d11f34cdec3a1c158db5fe81285b54e130b1e47aea190566fbaed45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x873A 11452 bytes

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