Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e0fc27365c9cc9a…

MALICIOUS

PDF

99.0 KB Created: 2020-08-12 13:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a83a5a52940d30d4ab2767354e90956a SHA-1: 174826a069e891f662a2bc530f911729c774a1fa SHA-256: 0e0fc27365c9cc9a476fff2f6c76ec1e49dd6ae732f1644e52f1d36cb82bcc87
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a redirector service designed to obscure the final malicious destination. The primary malicious URL identified is https://ttraff.cc/wb?keyword=cultura%20incaica%20pdf, which is likely part of a link farm to generate traffic. The ML classifier strongly indicates maliciousness, and the presence of many external links suggests an attempt to distribute further malicious content or phishing pages.

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/wb?keyword=cultura%20incaica%20pdf
    • http://sijisegab.springhillelectric.com/uploads/1/3/2/7/132740580/3837b27cf8c7.pdf
    • http://files.tacdlo.org/uploads/1/3/0/7/130775429/8690191.pdf
    • http://files.morrowartscenter.com/uploads/1/3/2/3/132302759/3525156.pdf
    • http://files.greenbuffaloestates.com/uploads/1/3/1/3/131383456/f65631.pdf
    • http://files.jomehndi.com/uploads/1/3/1/6/131606465/365c31d885.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7964/6878/files/basic_algebra_practice.pdf
    • https://cdn.shopify.com/s/files/1/0429/3971/1655/files/28848190906.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/31060692973.pdf
    • https://cdn.shopify.com/s/files/1/0437/1467/4841/files/gleichungen_aufgaben_mit_lsungen.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/9465166617.pdf
    • https://cdn.shopify.com/s/files/1/0431/5919/1712/files/98441845837.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/16167894216.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7433/files/40230674343.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5765/files/85517080999.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/tagokezofiridupofetud.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/ludepevas.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_off00014879.bin
3cda7b8c1c5af830dd1a5520a94cee7f78adbeba082322fa177f477f28249d97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14879 4876 bytes
font_01_sfnt_off0001591c.bin
1c52e51431134572654f9af21433bead8b63a412950a67e4fb391bac1ae99ffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1591C 11260 bytes

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