Malicious PDF — malware analysis report

Static analysis result for SHA-256 7720812a159b0bc4…

MALICIOUS

PDF

41.4 KB Created: 2020-08-26 08:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 832e86a99873ac6132e0b8ddb47aacbc SHA-1: 5355e70724a2f719a30f9647bbb446c2df34154f SHA-256: 7720812a159b0bc48f3eca47fb9c219d39c3c493aae34e4e8daff10569babaa3
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external resources. One of these links, https://ttraff.cc/pify?keyword=critical+thinking+and+problem+solving+skills+for+the+21st+century, is identified as a malicious redirector. The document's structure and the presence of numerous links suggest an attempt to direct users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.cc/pify?keyword=critical+thinking+and+problem+solving+skills+for+the+21st+century
    • http://files.hospismelaka.org/uploads/1/3/2/7/132740905/041ba10b05aeba.pdf
    • http://suraruz.obsmanual.com/uploads/1/3/1/4/131453133/7814200.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/9825/7048/files/43863716490.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/47143490263.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/national_osteoporosis_guidelines_uk.pdf
    • https://cdn.shopify.com/s/files/1/0459/8815/1458/files/imdb_hitman_s_bodyguard_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8044/files/bradescard_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0448/1875/9842/files/levedewij.pdf
    • https://cdn.shopify.com/s/files/1/0436/9163/8934/files/what_is_a_weebo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0352/6820/files/dethklok_tab_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/11044934315.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/fox_halftime_report_cast.pdf
    • https://cdn.shopify.com/s/files/1/0429/8267/0485/files/japolaja.pdf
    • https://cdn.shopify.com/s/files/1/0436/5746/1913/files/android_podcast_app_auto.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_off000061d2.bin
8f6e0ccbcd69450763545097a9a26b3991d37a7cdb6954b6d00f03e4abe393b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D2 6024 bytes
font_01_sfnt_off0000762a.bin
aef938f4125815a466143a693d87841d66dfb9aa53672678c60123da7ecaa7a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762A 9960 bytes

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