Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d895c71e93687a9…

MALICIOUS

PDF

61.2 KB Created: 2020-08-22 18:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5a132092d07f87df0cb9ced19131ba0 SHA-1: 368cf1e0083d8408cfde5c31202287594a804812 SHA-256: 7d895c71e93687a9affb4a5ad1b9c94d06988b05e269ad531add8ab15071b9ac
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'adb shell android settings' and includes URLs that are part of a link farm. The presence of a malicious redirector and a large number of external links suggests an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

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/pify?keyword=adb+shell+android+settings
    • http://bagoja.queenofthewaves.org/uploads/1/3/0/8/130814328/1079946.pdf
    • http://jofejol.croberts100.com/uploads/1/3/1/8/131857114/rubelumeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7507/6258/files/90204977303.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/47635938219.pdf
    • https://cdn.shopify.com/s/files/1/0434/3319/7718/files/wafusojezijuxop.pdf
    • https://cdn.shopify.com/s/files/1/0437/0258/3449/files/bofer.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0302/files/xenuv.pdf
    • https://cdn.shopify.com/s/files/1/0463/2100/8802/files/apa_manuscript_guidelines_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/98931901781.pdf
    • https://cdn.shopify.com/s/files/1/0428/7420/8415/files/congruent_shapes_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/vuziza.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0322/files/hartman_color_personality_test.pdf
    • https://cdn.shopify.com/s/files/1/0440/2590/5317/files/queen_bohemian_rhapsody_partitura.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab77.bin
2afd5d19bd551fce87c3eba51410828571df8693ba9ab3502b021d03b36df4af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB77 5216 bytes
font_01_sfnt_off0000bd25.bin
239e780d01013c8e26801f41a07dcd644910db8a7cca2cfd59b04bace283b268		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD25 13504 bytes

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