Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57ca3bc1f5ec09f…

MALICIOUS

PDF

43.4 KB Created: 2020-09-08 23:40:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 19736de8b0ef0808c2b3f3047c631e76 SHA-1: b1c72f663f8a3d5740a14edb8550d6b59019b6e6 SHA-256: a57ca3bc1f5ec09fcafc2600043e82893c51e18d5c3165cf89176ad05720fd79
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The presence of a 'download button' lure and a high ML classifier score further indicate malicious intent. The document likely aims to redirect users to malicious infrastructure for further exploitation.

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/wix?keyword=django+formset+template In 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/1/0431/3006/0955/files/rafosopasa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4693/5447/files/fedelilivunekit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4514/0118/files/synonyms_list_for_ielts_reading.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_8b2e0677ffdc434289e2fae52a9c2527.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e4bc37_3a48a6b5ac1447d2b4b06ca9b0bda97f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d5cf39_c13eca50134746a89707eeb08471df87.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/98d33d_1fd978d2b24f4da3a48873f11ef26355.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d5415a_e3fcfd8dce1342029e71856c73d3d8f2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_ad56bf27fbdd4f50aa7d76d2fb30a763.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7836c9_e42ef0d4b609457b9aed2cbc7cc0a496.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/36f25b_0352f306ecfc47eea3b4fe9c6250589b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/muful.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6770/3450/files/poketi.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_off00006425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6425 5296 bytes
SHA-256: 9b84b2d83934479cb360df13d7ace09a3ca4440cf5430d8f05cabc0653ba00d5
font_01_sfnt_off00007625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7625 13700 bytes
SHA-256: d639ad4e7c82b20718d68b478c8634df33de9ad61dfb80df959a3ccf0592d43c

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