Malicious PDF — malware analysis report

Static analysis result for SHA-256 6889b635a0fe0a4f…

MALICIOUS

PDF

49.5 KB Created: 2020-08-12 04:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 013cf4e38c6b7214be44cd94440eb685 SHA-1: caaf6b18386ca5cd35a1f75947c50d36bf616c6a SHA-256: 6889b635a0fe0a4f4aec5570118d6967fe645ca95b32bc3f3191bd5e63a4b568
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 identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO poisoning scheme to lure victims to malicious sites.

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=waste+biorefinery+pdf
    • http://xufilu.xanderkarkruff.com/uploads/1/3/1/4/131437987/wixoson.pdf
    • http://files.cocrimeanalysis.org/uploads/1/3/2/7/132712206/6648375.pdf
    • http://nufidolu.shearfinessehairacademy.com/uploads/1/3/1/3/131398367/gilisasuvorarowoz.pdf
    • http://files.brianmonteithart.com/uploads/1/3/1/8/131856257/fe40b31.pdf
    • http://files.findingbea.com/uploads/1/3/0/7/130740213/xobiwerafama-texegofamex-xuzuje-zesajiforupo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/9559/4910/files/cecelia_ahern_the_gift_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4621/5584/files/dorumutida.pdf
    • https://cdn.shopify.com/s/files/1/0436/9671/7992/files/12346882135.pdf
    • https://cdn.shopify.com/s/files/1/0436/1335/6189/files/kafka_consumer_offset_checker.pdf
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/ponasadarowakasuxat.pdf
    • https://cdn.shopify.com/s/files/1/0430/8339/9329/files/12650007017.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/66484759431.pdf
    • https://cdn.shopify.com/s/files/1/0436/9252/3675/files/push_to_new_branch_github.pdf
    • https://cdn.shopify.com/s/files/1/0438/1537/0912/files/kezewumafumujedobijorif.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7539/files/jiruka.pdf
    • https://cdn.shopify.com/s/files/1/0438/3699/7792/files/34475243166.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061cd.bin
212c453d4bd1bd213d1eb59aab6caf977161276c5817fa3a676dc6a12e99f617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CD 5048 bytes
font_01_sfnt_off00007306.bin
d8ac7f842c555ba88a1ca15b0cf71e73cc66c392c549255eb29f76a245f33901		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7306 10084 bytes
font_02_sfnt_off000095a6.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95A6 16204 bytes
font_03_sfnt_off0000aad4.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD4 4324 bytes

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