Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ccd95989859a9a0…

MALICIOUS

PDF

42.2 KB Created: 2020-10-15 11:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 444e3814ad71357609459c371f42e607 SHA-1: 377c838a7405e1e5dc6cda22bcd8bfcbdda4b2dc SHA-256: 4ccd95989859a9a0d43b6ac82d96d23f984eb49debf30f6643a5abae0cf17b87
154 Risk Score

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 host further malicious PDFs. One prominent link directs to a known malicious redirector, suggesting an attempt to funnel users to malicious content, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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/strik?keyword=android+studio+3.3+download+for+windows+7 In PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/tixobenudofezibet.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/138303.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/xusavu_zerezujikewe_vikepegujojaluw_duvorafof.pdfIn PDF document text
    • https://site-1039638.mozfiles.com/files/1039638/75782827914.pdfIn PDF document text
    • https://site-1043307.mozfiles.com/files/1043307/34731267385.pdfIn PDF document text
    • https://site-1043855.mozfiles.com/files/1043855/fodakorug.pdfIn PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/90007648345.pdfIn PDF document text
    • https://site-1036702.mozfiles.com/files/1036702/61031987741.pdfIn PDF document text
    • https://site-1038475.mozfiles.com/files/1038475/57516865166.pdfIn PDF document text
    • https://site-1039179.mozfiles.com/files/1039179/kipurojutijumin.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/busixakowun_zefisuni.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/mofep.pdfIn PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/ritotemopotu-madadukuneje.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/1/0481/0670/0963/files/59640436973.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6277/1358/files/hampton_cruiser_bike.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1358/9152/files/war_strategy_games_hacked_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5767/4920/files/the_sleep_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4155/7160/files/92740883062.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7000/0804/files/80303582411.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9161/4614/files/where_does_most_nutrient_reabsorption_occur_use_figure_26-2.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_off000066a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A8 5260 bytes
SHA-256: c548851ca4f6f311630e397d1ad52f811b4c332d5ce357250983e5425e32c24d
font_01_sfnt_off000078b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78B3 10116 bytes
SHA-256: 7a5b72ac1a5392aedec28510e4495d358a3a97b66b9fa5de3eed007a07d5fc4b

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