Malicious PDF — malware analysis report

Static analysis result for SHA-256 e221426a6fa3c185…

MALICIOUS

PDF

35.7 KB Created: 2020-10-27 22:34:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ce28eeeb68dbbe0cfc78839a3b8e90f SHA-1: 938cbcdfa1051fec109e1586b982202089c856fe SHA-256: e221426a6fa3c1855971dc1c991e63af4c3403d41b3ce3b61e1fc2987b909bf1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, including one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to direct users to potentially harmful 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://ttraff.ru/123?keyword=let+it+rise+deitrick+haddon+lyrics
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/baravijubegavuv.pdf
    • https://nimukitu.weebly.com/uploads/1/3/4/2/134266418/rasefeku.pdf
    • https://suzaruluzi.weebly.com/uploads/1/3/4/4/134455671/c035d78f337.pdf
    • https://cdn-cms.f-static.net/uploads/4392647/normal_5f93096500212.pdf
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f89b7f59a6d8.pdf
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5f93cddf6043d.pdf
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f97e58a290ec.pdf
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5f94edc5a01b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/guwajotutitulemubiwaxekam.pdf
    • https://cdn.shopify.com/s/files/1/0498/5877/3154/files/the_fall_camus_novel.pdf
    • https://cdn.shopify.com/s/files/1/0433/7808/1959/files/waves_tune_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/niwugugumuvuvodik.pdf
    • https://cdn.shopify.com/s/files/1/0505/4791/6997/files/91648365591.pdf
    • https://uploads.strikinglycdn.com/files/4a036dc6-2051-460f-9778-45be9066ee1b/1.1.1_metas_y_factores_competitivos.pdf
    • https://uploads.strikinglycdn.com/files/45b4cf90-85ff-4b55-8e6a-dedd0e6a95ad/zegekipimononuxebiki.pdf
    • https://uploads.strikinglycdn.com/files/f36c2aa8-b358-4ec2-bc9e-46cda73c3543/51804967681.pdf
    • https://uploads.strikinglycdn.com/files/950e829a-ea25-4a33-ba8e-0e24e60a6376/nuwazomikokerejelobidal.pdf
    • https://s3.amazonaws.com/fasanag/72901694732.pdf
    • https://s3.amazonaws.com/zidosozawok/mojilu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/intex_challenger_k2.pdf
    • https://cdn.shopify.com/s/files/1/0438/4161/8082/files/adkar_change_management_models.pdf
    • https://cdn.shopify.com/s/files/1/0498/7990/8504/files/dujenarurijolutezu.pdf
    • https://cdn.shopify.com/s/files/1/0482/7915/8948/files/colorectal_screening_guidelines_aafp.pdf
    • https://cdn.shopify.com/s/files/1/0431/0895/8362/files/install_gradle_manually_android_studio.pdf
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ea7.bin
a4ae284806869611e1a030c03820f718273c62bcd24799ab5123923b5d33fc73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA7 5132 bytes
font_01_sfnt_off0000601a.bin
854f64fb7a710f064385c08782e14243e632f20d35ae016a22e37880b62d46ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601A 9912 bytes

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