Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f7b62f094d74d9…

MALICIOUS

PDF

45.4 KB Created: 2020-10-12 13:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: db8fa3f7907091a35340277a4e7834d1 SHA-1: 9984431aa804529bcc50dcff2266e99ac8a3dfa8 SHA-256: a6f7b62f094d74d91a56f8186d906d67a198d2dd216d911ffcdf318a64bdc559
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to malicious infrastructure, disguised as a search result for 'mcgraw hill act 2020 pdf'. The ML classifier strongly indicated maliciousness, and the embedded URLs point to a redirector service known for distributing malware. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to potentially malicious content.

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://cctraff.ru/pify?keyword=mcgraw+hill+act+2020+pdf In PDF document text
    • https://site-1038601.mozfiles.com/files/1038601/43192410784.pdfIn PDF document text
    • https://site-1036753.mozfiles.com/files/1036753/10396415732.pdfIn PDF document text
    • https://site-1039295.mozfiles.com/files/1039295/runiwovatenigazekunifuke.pdfIn PDF document text
    • https://site-1039840.mozfiles.com/files/1039840/pemurawilijovurifilojopi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0115/1128/files/79863756247.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3876/8793/files/green_light_msma_crabgrass_killer_label.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0271/6572/files/game_of_war_secret_core_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a290702-7d20-4ba8-a0e6-64aafb47dc7c/pegatavubano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f97181f-9a7a-42c1-b8f3-dd85cd85a0b4/widot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a07ac26a-954f-4ff2-9348-fd1b65553736/wovugenurawenelumikegipu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3477/4174/files/boris_kipriyanovich_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/piribonesasasufedatejulip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3816/1561/files/47911779000.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3062/5947/files/effect_of_germination_on_pea_seed_respiration.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3189/5457/files/bulletproof_diet_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6451 5064 bytes
SHA-256: 45daebcb0b7f75ed7d2b659c0502b28dbe2c847fdc9c0a94a9c15456baab6840
font_01_sfnt_off000075af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75AF 10796 bytes
SHA-256: 862c0e8a11673fb5bbc387c75340093282eb43e462e1a96113cda92825b0de2b
font_02_sfnt_off00009aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAE 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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