Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ad7facaba253cd…

MALICIOUS

PDF

36.6 KB Created: 2020-09-16 16:39:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa9a8b1941ef28f28005cc314315cd40 SHA-1: fe406bb8c44cb6f7efbf1c810783f28009f81d49 SHA-256: 11ad7facaba253cd3f1f05a1f9fce2c00c9e757f52f3148017caa3c87104b11c
154 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 pointing to 'https://ttraff.club/wix?keyword=shurlok+lock+box+manual'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are benign Shopify links. The ML classifier strongly flagged this PDF as malicious. The presence of a malicious redirector suggests an attempt to lead the user to a malicious site, likely for phishing or to download further malware.

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.club/wix?keyword=shurlok+lock+box+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/axtel_telefono_reporte.pdf
    • https://cdn.shopify.com/s/files/1/0430/9650/6521/files/breakneck_apk_aptoide.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/37247792337.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/64504999473.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6632/files/11985487377.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4885/files/piping_isometric_drawing_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0431/3477/9553/files/causes_of_deforestation_in_zambia.pdf
    • https://cdn.shopify.com/s/files/1/0439/8268/4318/files/84770167159.pdf
    • https://cdn.shopify.com/s/files/1/0439/2720/8091/files/scarlett_2i4_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/givimivimis.pdf
    • https://cdn.shopify.com/s/files/1/0429/1395/6006/files/angularjs_ng-_controller_in_directive_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/2178/5498/files/bomavewobagaxidabosibo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/first_grade_sentence_writing_worksheets.pdf
    • https://80f2c3af-c934-4997-ab4b-3b7c2a9af4d3.filesusr.com/ugd/d5415a_5ba241fc8ac64fd0a565894442d8ce97.pdf?index=true
    • https://b5b83444-8cec-437e-8e0b-c6e10dab6743.filesusr.com/ugd/f08e01_bc6b79389e754df6a96ebd2411e6ba79.pdf?index=true
    • https://c72f0730-db48-4cf4-aeb7-52055bbf4bb9.filesusr.com/ugd/d4a9d6_72ceeff4c8eb44d1b0c145295e7957db.pdf?index=true
    • https://a6d22f70-c99c-4244-a887-6e0f6d9963f6.filesusr.com/ugd/ed2d23_7b083da3bb104504a40de58597477285.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005035.bin
c2c0b00fca33d3eec8a32e426f886e532ad01f9a0348b5897eb77805380dfabe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5035 5236 bytes
font_01_sfnt_off000061df.bin
5b5a1c6c07e09a529b690de7e9227713b6731ed6fb77f0abaf2bf07941c03cac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DF 10028 bytes

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