Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f32632895df979…

MALICIOUS

PDF

52.8 KB Created: 2020-10-02 19:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d7ebe6d03daf9cfe0dc846f174760db8 SHA-1: 653087e820c683e8183af8414547b729d610278a SHA-256: 88f32632895df97988afae4e9525cb61941a5b467b92a9bbf3ea3cd7c5f9a5c1
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to known malicious redirector infrastructure at `https://gettraff.ru/strik?keyword=introduction+to+psycholinguistics+steinberg+pdf`. The document body, though heavily obfuscated, also contains this URL, indicating its likely purpose is to drive traffic 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://gettraff.ru/strik?keyword=introduction+to+psycholinguistics+steinberg+pdf In PDF document text
    • https://site-1036750.mozfiles.com/files/1036750/wukabusubabuxemeluwazof.pdfIn PDF document text
    • https://site-1039553.mozfiles.com/files/1039553/45391160197.pdfIn PDF document text
    • https://site-1039698.mozfiles.com/files/1039698/sunefanijewibumez.pdfIn PDF document text
    • https://site-1039560.mozfiles.com/files/1039560/kubevem.pdfIn PDF document text
    • http://files.swedishrelics.com/uploads/1/3/0/7/130738701/d1d34fe82.pdfIn PDF document text
    • http://mupezijix.tiffanystudios.org/uploads/1/3/1/6/131607712/2444168.pdfIn PDF document text
    • http://files.mariagoundry.com/uploads/1/3/1/3/131384555/4679306.pdfIn PDF document text
    • http://files.commongroundcommunitycenter.org/uploads/1/3/1/3/131397946/61dd790.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0348/6103/files/xitibuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/c2cl2_lewis_dot_structure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2931/4206/files/19757428756.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0030/1221/files/showbox_apk_app_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6033/6542/files/miles_and_huberman_data_analysis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3730/5243/files/13938253203.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2538/3073/files/insect_netting_home_depot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9529/6673/files/59314755960.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009737.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9737 25904 bytes
SHA-256: ca3611ac3db43f8af3768a3668eb0e4187e23f3da9c81665ea22c4ac72218558
font_00_sfnt_off000061e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E3 5384 bytes
SHA-256: 792efd39daef30803beca2fab7eaa466625ad4e06c04b63bcd88b46d139c947c
font_01_sfnt_off00007430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7430 10208 bytes
SHA-256: be5780d75043c19970ef0757a2b570f6bdad3f0eb03517da3ae9700323bcb585

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