Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e968532dc00c2c…

MALICIOUS

PDF

47.0 KB Created: 2020-10-19 02:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7ebf1ce4e926d88df59439fe106035bb SHA-1: 90eb586dc0f52a95b3567f1ec2a44d9df0476ea8 SHA-256: 68e968532dc00c2cbbfecda6323cc9785502c6020794d41b9d3b9c43380b2f6f
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to a URL designed to lure users with search engine keywords. The document body, though heavily obfuscated, contains references to the same malicious URL and a large number of other PDF links, suggesting a link farm or SEO spam tactic. The ML classifier also strongly indicated maliciousness.

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/123?keyword=top+antivirus+app+for+android+mobile In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5f8a168cb4413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f8b2fdf26fa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f88ebb4b895c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5f8cc42e2c538.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/nukexifepejisox.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/busixakowun_zefisuni.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/wirexanusir.pdfIn PDF document text
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/ragabelata-zetamu.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/ea39c33e-090f-4a9d-a8ec-bf2dba1cda5d/fudokewolikowufazekelox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de580eb2-8d3d-4ee0-a5df-818fa516b8ed/69406742374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5404acc-3440-4ab1-a37a-1f1e6d040412/27162245959.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5720/9240/files/data_flow_diagram_level_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9631/3508/files/dexobevik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2272/7353/files/gifewupepolurokosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/2384/2718/files/super_tech_oil_filter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7890/0640/files/69140946683.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5290/0260/files/parts_of_the_globe_theatre.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/5116/8156/files/socrative_user_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4452/8550/files/confessions_of_a_sociopath_espaol.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_off0000787a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x787A 5336 bytes
SHA-256: cb796f373b98612a54c5b63d1d87e6b214688ce517b3bd7b0aff8d6c991e99d8
font_01_sfnt_off00008a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A84 10580 bytes
SHA-256: 02ff147f9a3db6313f87dfd2822397391471d662df40c8332398b3200e570a6e

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