Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ce31b40b4eed9b…

MALICIOUS

PDF

40.5 KB Created: 2020-10-26 12:36:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 38faf7f6d241f24496a16953ef09e017 SHA-1: d62a415e45dd3dbe319712edc2004b21de3b3af2 SHA-256: 38ce31b40b4eed9ba0da4b20102d811a23469991af8e99d5bcff3935ed087bd9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to disposable hosting, designed to redirect users to malicious infrastructure. The primary redirector URL is identified as malicious. This behavior is consistent with a link farm used to distribute malware or conduct phishing campaigns.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=islands+pearson+activity+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_5f90b95604b51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f8d40cbaa7a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f8f87bdcbefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_5f8d6ea3a7409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5f8e4ea6716f5.pdfIn PDF document text
    • https://parukiwodisurup.weebly.com/uploads/1/3/4/4/134455528/luwuvetojepe.pdfIn PDF document text
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/5967797.pdfIn PDF document text
    • https://zozolexiwu.weebly.com/uploads/1/3/4/3/134343356/387f9ae4d.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/rutekonenezosovig.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/5d2a1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_5f90a20060c98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f8dc65e6d089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409607/normal_5f968226397bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5f8f28a832640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5f953feb3bd0c.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/1/0433/4387/2150/files/20380319459.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8137/8208/files/download_cashflow_game_apk_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/5539/1132/files/ratios_and_proportional_relationships_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/the_resistance_band_workout_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/27859700055.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/sidulezexenoniliwivugulox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2587/3050/files/fijezesogoriz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5331/2928/files/developing_a_research_question_activity.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1157/8275/files/xutegomadaxitabazi.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_off00005e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E44 5452 bytes
SHA-256: be4d92630d321172ad2a08af8137cbcceefcd811e8abc98011dadb9b0088ee6e
font_01_sfnt_off000070dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70DC 10428 bytes
SHA-256: f948d594737a1a5f000d53dce457523c6ba28496e604200622a0eef47df5ed20