Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2753336de891e1…

MALICIOUS

PDF

39.0 KB Created: 2020-09-17 08:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 103d977ae895afc56deda55a949b38de SHA-1: 9137790e39235fc41e21a1fdd3143723d4e6548c SHA-256: ac2753336de891e11a4b8de9b6aae9e4d79738356dc395de3da684f779bce223
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links that lead to a redirector service, which in turn points to a malicious URL. The document body, though heavily obfuscated, contains text related to 'Packet tracer' and the malicious URL, suggesting a lure to trick users into clicking the link. The heuristic firings confirm the presence of malicious redirector links and a link farm within the PDF.

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://ttraff.link/wix?keyword=packet+tracer+2.2.5.5+answers
    • https://cdn.shopify.com/s/files/1/0431/0401/0389/files/66226291714.pdf
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/fanememogabu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7802/5377/files/kisolubatipudi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/kokanixodexapa.pdf
    • https://cdn.shopify.com/s/files/1/0447/8137/1543/files/biblia_cristiana_descargar.pdf
    • https://9863bba8-d46d-4286-bae6-0f0372f83d4d.filesusr.com/ugd/17159d_34851dce0f3944b5bb6d7f29f43705ab.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0458/1346/5254/files/correct_usage_of_articles_in_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/42505458910.pdf
    • https://cdn.shopify.com/s/files/1/0430/1425/8851/files/42190442660.pdf
    • https://cdn.shopify.com/s/files/1/0431/6699/0502/files/86485985040.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/jusalulup.pdf
    • https://31ade729-c037-49fb-9b4c-e8fc4958483c.filesusr.com/ugd/5a1791_732e1a01d962498fb867f605b4c78614.pdf?index=true
    • https://192d3515-cdff-4f8e-8289-0da2767cbe7a.filesusr.com/ugd/8ce377_3c7dd994300240f6b262046cd27ee713.pdf?index=true
    • https://59d5f3d6-64fe-452e-9f69-c45bf6ac217f.filesusr.com/ugd/76156b_bae2ead255334ca0bb051387f99be321.pdf?index=true
    • https://7add3af1-38c6-4214-aedc-1c342eb2a587.filesusr.com/ugd/b910ae_0507d4afd6cd43b1a71900dcca2c8881.pdf?index=true
    • https://cfb5a914-701f-42d7-b228-595ad1f28540.filesusr.com/ugd/3ed44c_5da379ac9c2348ca869485cb0a7e9c47.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b11.bin
f09212739fb464fff6602f6354f482ed9c42b3c0989b841477b9cd988a457de9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B11 5204 bytes
font_01_sfnt_off00006cf3.bin
fc00cef46320c2b4dc02262063428ec43240ce0415fddf90dc965a3b0ad72416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF3 10072 bytes

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