Malicious PDF — malware analysis report

Static analysis result for SHA-256 6773ecae1326efe9…

MALICIOUS

PDF

50.3 KB Created: 2020-07-21 09:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a76b53dc445a35482be2aba976eef9a SHA-1: 5adcb4c56347c3d2b5b45c9978f1c3d9aab67650 SHA-256: 6773ecae1326efe920143dacb11aa222333f1e4b70e750a9a089e952af180e2e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links suggests an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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=multivariate%20time%20series%20analysis%20and%20applications%20pdf
    • http://files.mudgleyholidayhouse.com/uploads/1/3/1/4/131453650/ba273df1.pdf
    • http://files.islandcitypublishing.com/uploads/1/3/0/7/130776327/monidel.pdf
    • http://files.ginotorres.com/uploads/1/3/1/1/131163747/timejazuw.pdf
    • http://files.threewellsofthesea.com/uploads/1/3/1/1/131163590/wokikor.pdf
    • http://files.mothersylvia.com/uploads/1/3/1/0/131071312/5391583.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1451/9973/files/3006672033.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5842/files/79560465706.pdf
    • https://cdn.shopify.com/s/files/1/0429/5727/5299/files/tekifuwegabiruzimo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/juketisafixixuwu.pdf
    • https://sanolosu.files.wordpress.com/2020/06/41966047610.pdf
    • https://ribuvez186628289.files.wordpress.com/2020/06/57585015965.pdf
    • https://bazolexadole.files.wordpress.com/2020/07/38963403707.pdf
    • https://laxokabe513272239.files.wordpress.com/2020/06/bafugufegizuturawopiza.pdf
    • https://jupudipi.files.wordpress.com/2020/07/pazaxunuxejabidef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sesolofulazige.pdf
    • https://cdn.shopify.com/s/files/1/0438/1681/2706/files/49160958985.pdf
    • https://cdn.shopify.com/s/files/1/0431/6469/6738/files/19495627222.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/67422768258.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/81575484487.pdf
    • https://cdn.shopify.com/s/files/1/0433/0645/1094/files/lidamopazigofagunudowo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9232/0161/files/pedimejimirepixax.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/50460511291.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_off00008368.bin
5fc6b61e8706ec0723d02a729f1bd7808bd74580b0061eb0b17f0a6ecb0166e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8368 5352 bytes
font_01_sfnt_off0000958c.bin
3f861882123d80969f2fb23c9f1b280ee2ee53a105b42a7625d63b20d1b49723		 pdf-font-stream PDF embedded font (sfnt) at offset 0x958C 10652 bytes

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