Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2e9ee8e4a0f1ea…

MALICIOUS

PDF

44.6 KB Created: 2020-08-17 15:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03dbc7cb4420ac404072a68e16feb8ba SHA-1: dc8c868233038f0243cb01e722d5125d7a041f89 SHA-256: 5f2e9ee8e4a0f1ea5fa9f2d11b99ef2c3ef434453be9e735e5ec55ad8602e5a8
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure related to educational reports, likely to trick users into clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector is sufficient evidence of malicious intent.

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.com/pify?keyword=department+of+education+clery+act+reports
    • http://files.wwhsphysics.net/uploads/1/3/2/3/132303310/limiwafufu-jigutozikavunej-vejetabakobe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/8568/5153/files/koroziredid.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/buxawozox.pdf
    • https://cdn.shopify.com/s/files/1/0428/5382/6726/files/antenatal_care_nice_guidelines_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/6148/4437/files/jgr_oceans_author_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0438/3073/9106/files/joxebepipugo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/ehlers_danlos_syndrome_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7427/files/98377524756.pdf
    • https://cdn.shopify.com/s/files/1/0432/4501/1112/files/sebironi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/fevegupuxotamosujuvotisa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3492/6495/files/48701464471.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/vukibabiladusazos.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/14742061782.pdf
    • https://cdn.shopify.com/s/files/1/0440/7836/6885/files/kunujed.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_off000061af.bin
da3a99aa423f128564349608114a625c6acaa465d8b47fa978360c5a8a694d37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61AF 5284 bytes
font_01_sfnt_off00007397.bin
92215f3340d256b8d434e60e16914b20b206226a5f04fbee8bc66e2d2575a8fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7397 10352 bytes
font_02_sfnt_off00009709.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9709 4324 bytes

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