Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a204f2f4a6c2c6…

MALICIOUS

PDF

38.4 KB Created: 2020-07-08 17:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 248af21dc9de365a73577239ca34c1ec SHA-1: cc3c3008b16d15f9905b9f1730bf7205ecd72e59 SHA-256: e1a204f2f4a6c2c6d725e5cbd5e605619e40c1cd241b19f74324a3d6ac4ed70f
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 link farms designed to manipulate search engine results. One prominent link, 'https://ttraff.ru/wb?keyword=incomplete%20dominance%20punnett%20square%20worksheet%20answers', is identified as a malicious redirector. The document body, though partially corrupted, also contains this URL and other links, suggesting a lure to trick users into visiting malicious sites. No scripts were extracted, and the primary malicious activity appears to be redirection via embedded 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.ru/wb?keyword=incomplete%20dominance%20punnett%20square%20worksheet%20answers
    • http://files.cngwritersinkcom.com/uploads/1/3/1/4/131452991/wuwisefi_leguwe_fupotonozonudet.pdf
    • http://files.sanctuaries.org/uploads/1/3/1/8/131856443/jebegesogitesol.pdf
    • http://files.hello-baby-toys.com/uploads/1/3/1/4/131453807/4352687.pdf
    • http://files.okwp.org/uploads/1/3/1/4/131406433/dirogazurugoxe.pdf
    • http://files.ninelivestwine.com/uploads/1/3/0/8/130874629/vezik_gunefitotokek.pdf
    • http://files.graffitiwgratitude.com/uploads/1/3/0/7/130738814/808e7b1556b9ad.pdf
    • http://files.sweetcomfortcandy.com/uploads/1/3/1/4/131453560/xujiwupufudiw_gofelipofowi_gaxog.pdf
    • http://files.morjimcocopalms.com/uploads/1/3/1/3/131384789/2a0aea98a146c0c.pdf
    • https://vojuxudifubu.files.wordpress.com/2020/06/18511847118.pdf
    • https://buzugopi.files.wordpress.com/2020/07/pekovejusir.pdf
    • https://zadejexidaba.files.wordpress.com/2020/06/legazuxexatarewiwek.pdf
    • https://xovezuxa802976098.files.wordpress.com/2020/06/nanugekajalozedokanowosam.pdf
    • https://wuxafojibom.files.wordpress.com/2020/06/sejijulepukarotepop.pdf
    • https://vudetagot.files.wordpress.com/2020/07/jenoge.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/surorut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nazowexoratusitufunu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44603331863.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/82595467958.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005659.bin
f35ba3a40dcd388014d90ed0bdc1177cdf8b7cc350ba224e5946ec338171e0ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5659 5412 bytes
font_01_sfnt_off0000688f.bin
f7ba12128e57e5c280f078de6d545c2030c10e78c5b871f4ebc6ccbf1af7d14c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x688F 10536 bytes

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