Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb52ca1604d9c83…

MALICIOUS

PDF

37.0 KB Created: 2020-10-30 22:45:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 58de37a0e60ee394d9c7081e22602ee1 SHA-1: 2f5d638e7c81d4c1f03067cbd54d1b76d6814ee2 SHA-256: 1bb52ca1604d9c8392210e689029e676fe5070182e7a1b2ff94ed974ef8ae194
202 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple links to redirector infrastructure, specifically identified as an SEO link farm and a free-download phishing lure. The primary malicious URL identified is https://gettraff.ru/strik?keyword=super+smash+flash+2+apk+aptoide, which is likely used to distribute malware or lead to further phishing attempts. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gettraff.ru/strik?keyword=super+smash+flash+2+apk+aptoide In PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/kutimamovux_defusafun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_5f8e08ee9bf35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406809/normal_5f976aa46ff38.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/nufodurefenivog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f8715c6646c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f97913e0f378.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/18180eff-7fa1-402c-b036-783cbcf3e610/cemu_gamepad_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d60be93-72d4-480e-b055-c211184cce7b/pinaliseruxaweven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a8bf4e0-f5a0-478a-90db-fbf342c3067a/32184147234.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9554/6273/files/godzilla_script_1998.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/97127189911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc4bdf9-4345-4a9f-9491-e40ffc159a29/pulleys_worksheet_grade_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/9157/1905/files/fat_belly_dance_youtube.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_off00004fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FBD 5580 bytes
SHA-256: d0f4670f87e3d10e6cbc7a8042ce658b71f067a7323a3b2ecb0f2bef1e3edc4f
font_01_sfnt_off00006285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6285 10844 bytes
SHA-256: 5630d534dc3f1f2315a70d5e5a667017dfce80624d8cc9288e27f189c13f5eb6

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