Malicious PDF — malware analysis report

Static analysis result for SHA-256 366311570244133c…

MALICIOUS

PDF

46.4 KB Created: 2020-10-15 06:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8b0e58d444a6bf7e1ad214b79dc7feb0 SHA-1: 634ec6a171074d8f9c0654386a6ffa69e6c1ecf3 SHA-256: 366311570244133c8951a3c92c82a2f1b980fa4189f4d83b0543408933916aca
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document uses a cloud document lure to trick users into clicking embedded links. One of these links, 'https://ggtraff.ru/123?keyword=perfectly+clear+android+free', is identified as a malicious redirector. The document also contains a large number of links to other PDFs, suggesting a link farm or SEO abuse tactic. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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=perfectly+clear+android+free In PDF document text
    • https://site-1044108.mozfiles.com/files/1044108/rekelunagerijegegepa.pdfIn PDF document text
    • https://site-1042501.mozfiles.com/files/1042501/28848559547.pdfIn PDF document text
    • https://site-1039444.mozfiles.com/files/1039444/88640782257.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/vokuzamik.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/5920875c53688b.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/2434255.pdfIn PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/bekukuvave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f8768244272b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f876c8c93ae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f86f58d3b3c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5f87c8056d32c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f87448a13c95.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/zebetuwi.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/buvivegoxazi.pdfIn PDF document text
    • https://site-1037122.mozfiles.com/files/1037122/74050117604.pdfIn PDF document text
    • https://site-1043400.mozfiles.com/files/1043400/8606098108.pdfIn PDF document text
    • https://site-1039500.mozfiles.com/files/1039500/zamorak_god_wars_guide.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/1/0480/1042/8575/files/gotefoxotisuzofax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/44986681480.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5203/4969/files/nefalola.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2909/8396/files/fallout_3_fort_independence_hostile.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3407/3505/files/k-on_episode_13.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_off000077f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F4 4940 bytes
SHA-256: 6051f27ba4031976b14236b6a010c55cb852433253a043a41a35ae97d8fe977f
font_01_sfnt_off000088c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C5 10248 bytes
SHA-256: 44059bb66acf22822b41a8da0a3c05afb440989448f6760765a1cba29cf4800f

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