Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81ad15b7c97ea32…

MALICIOUS

PDF

47.1 KB Created: 2020-10-17 02:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 25fb09f89f72487a1ed7c4c6ff88ec8e SHA-1: f48ada43d6428527b61bcc761cfb64790ebca88c SHA-256: c81ad15b7c97ea32f1ce5155c33bf7f2e2d9cc53756504df58a437dd3320f57f
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to a URL that impersonates a download for 'Hungry Shark Evolution'. Additionally, it hosts a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were extracted, the overall structure and malicious URL indicate an attempt to redirect users to harmful content.

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://ggtraff.ru/123?keyword=hungry+shark+evolution+apk+download+free In PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/bupemigimamuvap.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/finonuk-vipulotoj-lenati.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/21d42e6fa978ba.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/76560270a.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/a1bf913001604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f88f0f1afeb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f87494880ccf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5f897f0ce614a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5f8a1f36633ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5f88d7cc97765.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/1/0430/7098/0245/files/vurisevunovasuvuzakulirol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5207/5681/files/cadet_fitness_assessment_audio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0036/4693/files/professor_leonard_statistics_6.1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3928/3608/files/american_holly_tree_leaves.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6353/6535/files/wezug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/4622/8127/files/52196481703.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5033/5384/files/download_game_nova_3_apk_revdl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7885/2007/files/grendel_chapter_7_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28bad2c-fd04-4161-8339-c887d0407f9a/37564279867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09820e2d-aa38-4d9f-bc54-61b3f29d0196/vuladisipar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/906fac7e-0abe-4744-91f2-66b16b4f5442/88506387340.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_off0000772b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x772B 5580 bytes
SHA-256: 4a58bd65060813a1c27fa89e2f72af83edf2c8eca098c7d8ee65067e839e1d5c
font_01_sfnt_off00008a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A37 10624 bytes
SHA-256: d3bce46d5d2633fb289b5230c8e2aaaefa9b27163cd73faeb598e43e6d6d4a8b

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