Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b5a8ab63eff674…

MALICIOUS

PDF

70.4 KB Created: 2020-10-25 20:22:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b55177e4bcdfd0a8a2c4f8ba603ca17b SHA-1: 997033cad039d287aaba8f274b4a5416fae1aeab SHA-256: 19b5a8ab63eff674c8a1e66501ac7ac4084df17fa9b16958e20c04a3924ecd2d
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 external resources, classifying it as a link farm. One of the primary links, https://ggtraff.ru/123?keyword=scale+drawable+android+button, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document's structure and embedded links suggest an attempt to direct users to malicious infrastructure, likely for further exploitation or phishing.

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://ggtraff.ru/123?keyword=scale+drawable+android+button In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5f8c8d4f883fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f9075c6bb8c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f91a9e2c3e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_5f8ec589a35e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5f8a8f85d4bf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f873553bd44f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f8cb3381479c.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/1/0487/7382/4678/files/the_scorch_trials.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4896/8100/files/android_9_release_date_lg_g6.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0147/0366/files/wayne_dalton_quantum_3212_learn_button.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3867/1526/files/halloween_stories_printable_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/divakekutogigutaf.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/gegodoka.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/la_reina_del_sur_arturo_perez_reverte.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/analise_de_riscos_ambientais.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/17236897525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7621/5473/files/tosumepikokinurov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3399/1612/files/calendario_hebreo_5780_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0676/8798/files/lesson_plan_for_science_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3497/6149/files/16360667260.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2684/0738/files/novita_air_purifier_nap_501_manual.pdfIn PDF document text
    • http://schemas.android.com/apk/res/androidIn 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_off0000d1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A8 5088 bytes
SHA-256: 3a145425c56fc098826c7389ccdac0d868e141f129eeba0a482ed6b3607440b5
font_01_sfnt_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 12592 bytes
SHA-256: 85df7fe089f8f4282161574f1c4d29e4a376da995569026680b843afe6770299

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