Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8acd42e49c84a2…

MALICIOUS

PDF

49.4 KB Created: 2020-04-04 10:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8d9760814ef3c35d5ce6d5055c98b17a SHA-1: 445518f85a54c5e74792072496bbdd63550d8ab1 SHA-256: 7f8acd42e49c84a23deece8c63f623d173b63bd906bcf025975b91d5712551c1
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are algorithmically generated and point to other PDFs. This is indicative of a link farm or SEO spam campaign. The presence of a LOLBin token sequence and ML detection further supports malicious intent. The document body, though heavily obfuscated, contains URLs that are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://ttmusb.com/uploads/1/3/0/4/130476168/130476168.html#unidad+5+transformaciones+lineales+pdf
    • http://millpondvillagecary.com/uploads/1/3/0/6/130639479/zozifaziwuse_zozomulamexo_fibimimipa.pdf
    • http://josepaisdecarvalho.com/uploads/1/3/1/4/131408791/1c078eef6e5.pdf
    • http://jaxmustangminutes.com/uploads/1/3/0/5/130589399/lawax.pdf
    • http://widowswalkabout.com/uploads/1/3/0/2/130289551/bb0e7009a00c0b.pdf
    • http://feralpix.com/uploads/1/3/1/0/131070637/wixikanumijiv.pdf
    • http://oldarizona.com/uploads/1/3/0/5/130589180/b9a83722ea5fa.pdf
    • http://perpetualreflections.com/uploads/1/3/0/8/130813957/pasiberojivumowuru.pdf
    • http://nicolas-rigaux-photographe.com/uploads/1/3/1/4/131438259/vefotejuga_rerulukuboluru_raketilirepix.pdf
    • http://your1life.com/uploads/1/3/0/6/130603968/5257429.pdf
    • http://thecurlwhispererchi.com/uploads/1/3/0/7/130739263/bozogusotumoxis.pdf
    • http://sustainablesuburbancommunities.com/uploads/1/3/0/5/130590126/nifusifopuvo-dadenura-malizifogekev-zeniwubok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000743c.bin
2f175d67f6b079ff1627a10ff17e5a5ca0a83cf28771cfdbfde81eb4ec5bc2ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x743C 9596 bytes
font_01_sfnt_off00009630.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9630 2652 bytes
font_02_sfnt_off00009f99.bin
27c5e8fef6f708e9242c6304c92d2d19f8e394ce19499076ce37841f4612a69f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F99 16460 bytes

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