Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90a014dbeba8c24…

MALICIOUS

PDF

47.9 KB Created: 2020-10-26 11:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a284b44a3b82ae6631c6370bb12c3421 SHA-1: ba19aeacfdfe11411d691a7beeb037782aa1df06 SHA-256: b90a014dbeba8c248df86de2c24f99d519bc73135973d8e0a48cfb2ac5f5e876
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://gettraff.ru/123?keyword=family+and+friends+student+book+1+pdf. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious redirection and link farming tactics.

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/123?keyword=family+and+friends+student+book+1+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f87e8d08503f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f8bc7429b5ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404107/normal_5f94369484fc8.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/1/0467/7763/0873/files/57741329573.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7841/0942/files/75052549929.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8078/7113/files/xbox_360_laser_replacement_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6050/1921/files/megipijebefatusewapifopu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0831/3509/files/uga_school_calendar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2054/8758/files/wafokibivuwexarasex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5155/6260/files/74561189703.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6574/8887/files/rove_battery_blinking.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0020/7272/files/fufubobizogizixuti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6680/9241/files/not_another_high_school_show_parents_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9824/6820/files/denipapidupu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7754/1281/files/el_rancho_weekly_ad_fort_worth.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8541/2546/files/vuwejerizetimutinuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5255/6184/files/download_font_for_android_phone_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0472/2570/0517/files/translate_thank_you_in_yoruba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6694/5447/files/guided_bus_tours_london.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6093/1991/files/kelipiwetamotomexivofa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8158/9432/files/77308568085.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A29 5500 bytes
SHA-256: f177161364cdd931861da072d499de06f9ee374e898a4cd1ca772fb36045c458
font_01_sfnt_off00008cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCE 10884 bytes
SHA-256: 00e10b63b05fbe5d986b59175384529aa30bb333c5a9e870dae142a8f384afc8

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