Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be7d86f57cd11f8…

MALICIOUS

PDF

49.7 KB Created: 2020-07-28 06:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 179fc3d08683912e48613e515d801830 SHA-1: 30ed6af533093ef82a6ba19c64ae0f57d6ae59c1 SHA-256: 6be7d86f57cd11f82dbe44c1b8f0316d1b9443aba6342fa55330216fd84be10f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting an attempt to lead users to harmful content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, likely for SEO manipulation or to host further malicious content. The ML classifier strongly flagged this PDF as malicious, reinforcing the suspicious nature of the embedded links.

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=hungry+shark+evolution+mod+game
    • http://files.herdiselmend.com/uploads/1/3/1/4/131455543/8393200.pdf
    • http://files.louisianaheartgallery.com/uploads/1/3/0/8/130814432/51aba6ad26f.pdf
    • http://files.shaymontgomerysoccer.com/uploads/1/3/2/7/132710704/b9c739.pdf
    • http://files.emmamagidart.com/uploads/1/3/1/4/131407668/fujakigevonetomado.pdf
    • http://files.randomnet.net/uploads/1/3/0/7/130776037/delel-xulowuliluwawan-wagepanonotu-jabejuxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/jelunovitagojajiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/44064320653.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vatajimawi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9105/0137/files/68856444729.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/7999/files/lipedijevefogavixewirujul.pdf
    • https://cdn.shopify.com/s/files/1/0429/7264/3491/files/98805991575.pdf
    • https://cdn.shopify.com/s/files/1/0435/3723/6119/files/zigaliwatujuzaruli.pdf
    • https://cdn.shopify.com/s/files/1/0438/7006/0704/files/41066859291.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/satetelalupapopunir.pdf
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/8773528585.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3767/files/42821887956.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_off00007cba.bin
810755ff9833c83100b89ca9d57b4451b51aefa9f507504d82568acdfaccf221		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBA 5308 bytes
font_01_sfnt_off00008e9f.bin
5d0f7f7b2d0bbbb65198364aced5b4fd618b04590cad5e804efe07be8004ab1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9F 13352 bytes

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