Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d04bf0b837e2738…

MALICIOUS

PDF

41.9 KB Created: 2020-08-31 04:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfd8ce376ae795c623786db8bd9b4318 SHA-1: 74248c83445810a1f42461bca71351ae5faff00b SHA-256: 6d04bf0b837e2738b571c959e2947dd97e5113618c97c819bc2e6895b6233bd2
162 Risk Score

Malware Insights

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

The PDF contains a link disguised as a dictionary download that redirects to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a malicious URL. While no scripts were extracted, the document's structure and embedded links suggest a phishing or redirection 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.cc/wix?keyword=sinhala+english+dictionary+download+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/24853a_2770650a83a64cc49768d7b5ee55c2a2.pdf
    • https://static.usrfiles.com/ugd/6f53d7_d08d8a749e01446694c82a9e700a9b5d.pdf
    • https://static.usrfiles.com/ugd/d162e3_607973dc4d9d4d0c99ddcb5de0b8b4bf.pdf
    • https://cdn.shopify.com/s/files/1/0436/3105/0915/files/grant_bargain_sale_deed_nevada.pdf
    • https://cdn.shopify.com/s/files/1/0432/7093/0600/files/aosp_and_build.pdf
    • https://cdn.shopify.com/s/files/1/0441/0641/6280/files/bodmas_worksheets_ks3.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9319/files/42168201937.pdf
    • https://cdn.shopify.com/s/files/1/0433/9544/8997/files/reading_comprehension_beginner_level.pdf
    • https://cdn.shopify.com/s/files/1/0432/2240/1192/files/19684565404.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/gasulilodojure.pdf
    • https://cdn.shopify.com/s/files/1/0433/9639/9269/files/tozixolawenesa.pdf
    • https://cdn.shopify.com/s/files/1/0462/7254/4917/files/94644460624.pdf
    • https://cdn.shopify.com/s/files/1/0434/2264/6422/files/34149198788.pdf
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/12936331085.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057ce.bin
21525720cf3195d346253d19314a4ba463d968fbd3f4165a3ee370b031a07f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57CE 5368 bytes
font_01_sfnt_off00006a06.bin
b66aa4169767330bfc6c765a16b1cf7b38be0d4f0c46c1e22944aae47334160f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A06 10036 bytes
font_02_sfnt_off00008c68.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C68 4324 bytes

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