Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc8fba594bc650f…

MALICIOUS

PDF

41.4 KB Created: 2020-07-29 15:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ac5489a79cc5552f5722209724295c6 SHA-1: 00bf58c315dd73f3e12f5fa955f3bc3c3963d943 SHA-256: 7fc8fba594bc650f592d84874800453465f8b3d57c363bb551a22cdaaa405488
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=descriptive+and+limiting+adjectives+worksheet+pdf+grade+2'. Another heuristic indicates a link farm of 18 external PDF links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious purposes, likely phishing or malware delivery.

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=descriptive+and+limiting+adjectives+worksheet+pdf+grade+2
    • http://files.lucypetersonwatkins.com/uploads/1/3/1/4/131437689/3eaf072.pdf
    • http://files.vertriebsautomat.com/uploads/1/3/1/6/131606206/xomusemuzejute.pdf
    • http://files.nileshagemann.com/uploads/1/3/2/7/132710624/fogabe-pivafamu.pdf
    • http://files.edenshalefarm.com/uploads/1/3/0/7/130776795/f965683d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/surobezesuxufefavafa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/53663969609.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61047377128.pdf
    • https://cdn.shopify.com/s/files/1/0437/2522/6152/files/puvugik.pdf
    • https://cdn.shopify.com/s/files/1/0437/0972/6870/files/lolaxetuzaninajirujopav.pdf
    • https://cdn.shopify.com/s/files/1/0437/2732/3301/files/51811087614.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/jidapaviretomujegepomip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nitupalakisotubawu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/gutuvimesasijelomuz.pdf
    • https://cdn.shopify.com/s/files/1/0438/0000/2717/files/dajaletij.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/vosexibebibe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0898/3203/files/sisusagiminifel.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/legelawetuloxidig.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/zazikiledela.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_off0000631d.bin
559c1cb48397c6223e99369f3ef7940bb4048820e7603b7aeae7ad8aab4fda08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x631D 5780 bytes
font_01_sfnt_off000076b4.bin
69e563f5b1d250207acc189ab3aa6c42668377c62182f04119e74db972079558		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B4 9700 bytes

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