Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fa443769d64c41…

MALICIOUS

PDF

35.8 KB Created: 2020-08-16 13:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3ee740bf137be0bf7cbf9e1620b2ff0 SHA-1: 4a9aa2134f479163996c0bd677126efe60fceadb SHA-256: 66fa443769d64c41b877dc7eb0200dfcc8f4f252aacdb91e8cddde6889f50fdf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and other links that appear to be part of a link farm. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=opencv%20python%20reference%20manual
    • http://files.jackiecheuvront.com/uploads/1/3/1/4/131438459/tilugizebejiva-wizovo.pdf
    • http://reluduzak.babysignswithmissmary.com/uploads/1/3/0/8/130874457/fenetife-nedomedaligexo-losub-velodekate.pdf
    • http://riwasade.milieu-art.com/uploads/1/3/0/7/130740145/pafedorukoxus_poxif.pdf
    • http://jurefotab.crestwoodbaptist.com/uploads/1/3/1/4/131437601/9400308.pdf
    • http://files.youngstaekwondo.net/uploads/1/3/1/4/131453823/kuzok_fesununavodu_gugabu_rabuginixujeruz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0795/7400/files/eating_disorder_guidelines_queensland.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/31627768209.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4838/files/10967479513.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/english_sentences_with_marathi_meaning_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/5413/5456/files/access_hosts_file.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/45684671643.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/manaxuganopenu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/vegoj.pdf
    • https://cdn.shopify.com/s/files/1/0436/3629/3785/files/988690347.pdf
    • https://cdn.shopify.com/s/files/1/0435/2255/6058/files/3875862922.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1278/files/63248863243.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/fepimiponanixiguserumifi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4011/files/documentation_of_clinical_pharmacy_services.pdf
    • https://cdn.shopify.com/s/files/1/0438/7949/7896/files/foguteza.pdf
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/zodunamibizerifesafoz.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_off00004cf7.bin
b00d1c1650cdd2eccd70e10df12432037ff606ce79924dcc27a96af9b6ee677f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF7 5268 bytes
font_01_sfnt_off00005ebb.bin
f1aefd8e22e28b025b4cc837f341fa554da7873d8cfdb3df432e26f76178fe20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBB 10464 bytes

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