Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f532b71adba20f1…

MALICIOUS

PDF

42.5 KB Created: 2020-10-26 18:57:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a7ac2ba8cc678732f50f56b777aacd84 SHA-1: 8ebecf4e923277f7a0f1fe54b7ea6b4512a35836 SHA-256: 8f532b71adba20f13d9b654489644d2093105b922140ecfdeaef2ae25bb8d7ed
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external PDF files, many of which are hosted on Weebly subdomains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially obfuscated, contains a URL that appears to be a lure for downloading software, further supporting the malicious redirector finding. No scripts were extracted, but the presence of numerous embedded URLs and the malicious redirector link strongly indicate a phishing or malware distribution attempt.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/123?keyword=prime+video+apk+for+pc In PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/kurutiv.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/816319e893468.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bagatazojiz_sidatasofugugor_sofaxazute_gureluf.pdfIn PDF document text
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/02d0dc.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/7360136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413126/normal_5f968c1ee0cbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f89dd99eed0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5f885d0800e32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389104/normal_5f93581501c94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_5f8fab7342412.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e708047-aaf8-4860-a989-3839eca6a9ef/risizirabotezi.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/binary_to_decimal_conversion_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/susilazapasoriwu.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/rutubodaze.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/myra_estrin_levine_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/morphology_of_flowering_plants_neet_mcq.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/8404/2406/files/nissan_sentra_2020_advance_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2951/0324/files/screen_lock_time_password_premium_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8309/3910/files/41787301462.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9586/0403/files/doterra_cost_per_drop_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4633/7693/files/jobijesolet.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_off000065fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65FA 5216 bytes
SHA-256: 011cff270de93f5e613b0e099b0acd4fa753aee2288d46ecadc21abb5d260553
font_01_sfnt_off000077a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77A8 11692 bytes
SHA-256: 9e891c00dffe16b21333aa491f75fe6a63da12487cbdac23532270b81af4c430

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