Malicious PDF — malware analysis report

Static analysis result for SHA-256 62053bb81a05e2bf…

MALICIOUS

PDF

73.7 KB Created: 2020-08-15 10:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cadb863f907fde42ba1209f119c9f155 SHA-1: e5f94ea9e3b9e8ebbb28f42603031f546039b742 SHA-256: 62053bb81a05e2bf5073e22bd06df83662e57b48ae35a3169bffeca6f3fcd820
154 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 a URL that appears to be the primary lure. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic, likely to obscure the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=folder+template+wordpress
    • http://files.pgoody.com/uploads/1/3/1/1/131164542/6126852.pdf
    • http://files.treestoseas.org/uploads/1/3/2/7/132711954/5757195.pdf
    • http://siluxu.jaxbeachlions.org/uploads/1/3/1/1/131164460/regopudapoj-zelepesixaregup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/5503/7093/files/xabozesiwixumolupiwusi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/wezawakikarakuz.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/taleluwawokub.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/9546622405.pdf
    • https://cdn.shopify.com/s/files/1/0435/7688/5416/files/ibps_computer_awareness_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/4197/2646/files/fivekojijetogof.pdf
    • https://cdn.shopify.com/s/files/1/0437/1723/0741/files/66632974582.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_off0000e522.bin
9325141d1ba1a4e399a1c6ece798a2179c795f8cfda64491ff3e782395541e4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 5152 bytes
font_01_sfnt_off0000f6a0.bin
3c4dd7a14fa4429e79cab62164873662be75806430ded78e872343343a7c2f9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 10408 bytes

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