Malicious PDF — malware analysis report

Static analysis result for SHA-256 4733c70aad147b1a…

MALICIOUS

PDF

44.9 KB Created: 2020-09-19 23:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef88cc926b544419c81fa90fd26e6bf3 SHA-1: 9aca47dd40c79aafb10f53949bd2d4951262f5ff SHA-256: 4733c70aad147b1aefc21d2f6e7f01be7111562971fe20ebb46c22a16b5d7449
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'vertical angles worksheet pdf'. The primary malicious URL identified is https://ttraff.me/wix?keyword=vertical+angles+worksheet+pdf, which is likely used to redirect the user to a further malicious destination. The presence of many links, including to benign Shopify URLs, suggests a link farm technique to improve search engine visibility for 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://ttraff.me/wix?keyword=vertical+angles+worksheet+pdf
    • http://files.rvabookloversfestival.com/uploads/1/3/0/7/130775557/falun_xatepolasivosup.pdf
    • http://nuvevowi.somoba.org/uploads/1/3/0/7/130776007/nirinamorekemag_winikilozuvama.pdf
    • https://cdn.shopify.com/s/files/1/0437/3859/5482/files/xagojoxoparibub.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/jobs_for_couples_near_me.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5082/files/guided_reading_passages_1st_grade.pdf
    • https://cdn.shopify.com/s/files/1/0428/0696/8483/files/63219619717.pdf
    • https://cdn.shopify.com/s/files/1/0482/4367/1194/files/57853277400.pdf
    • https://fd670e83-64cf-49b6-a11a-170cef5c5743.filesusr.com/ugd/dad90e_caeb67b9dd2546bd8ad5b6d4baa16c8c.pdf?index=true
    • https://cd2a6e2f-1146-44fa-beb7-3664b124d37c.filesusr.com/ugd/2274a7_0a9b021bf1974c5889da69b637be35f4.pdf?index=true
    • https://9d8e70e7-dd35-45ab-974b-00fccc2179d2.filesusr.com/ugd/2072cd_e41c15545a6e4ad58624470a271cb790.pdf?index=true
    • https://bfe68e40-6ded-4dc6-acdc-41c2e8cd3b22.filesusr.com/ugd/d2751c_2fd2e9d7971e45a8b7d3862e35532059.pdf?index=true
    • https://25429ea5-1eae-4e55-9dab-15618ed2e108.filesusr.com/ugd/3ce946_4b95ac109adf440ab2842879f647fd54.pdf?index=true
    • https://67b2328a-7720-46c2-82b7-e4bca29ad05a.filesusr.com/ugd/daca0d_325310b88f5642eb8d48b3d4eddb9ce0.pdf?index=true
    • https://006b21a1-68d9-401a-a0ef-1e630e2dfe90.filesusr.com/ugd/fafc38_935f3503f5f740c8910bce9ee583db1d.pdf?index=true
    • https://5cfb370a-4c62-4acd-8d2a-f4a6de9e5725.filesusr.com/ugd/bc4951_6391c994b1ea40fcbecb0260b8844a54.pdf?index=true
    • https://5f31348b-704a-4dc2-a674-e2ead3676efc.filesusr.com/ugd/7f16bd_9f485aa0b8434228be6836ed9bd150cc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cfd.bin
b6388caa22087b488e74e1c434a1b86d1d300c996168e755421f622048966456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFD 5540 bytes
font_01_sfnt_off00006fe4.bin
7269bb80fe93f72fe20f4fe4576ec109e83bc86d5278e86e7258499e3a285ca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE4 9920 bytes
font_02_sfnt_off00009218.bin
f3b752e25d2e3098dc5b351a512c5ca672d2b137fcb7ddb3f81b2384be51d5c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9218 16072 bytes

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