Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e22fab8d34fd552…

MALICIOUS

PDF

45.0 KB Created: 2020-07-12 23:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0adc79f25fd5a043cdea67ea481be342 SHA-1: d119a4f7415a7a061e4ed493c9996cb386347eb1 SHA-256: 0e22fab8d34fd552a33b229e9f69ee19c35ef2b44d55702b862c7cdf5846e2bd
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to appear as legitimate educational content. One of the primary links directs to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier strongly supports the malicious nature of this PDF.

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=cell%20organelle%20functions%20worksheet%20middle%20school
    • http://files.pharosjot.com/uploads/1/3/1/4/131453610/roradovixem_vemexisegida_farewilesojawip_tarowev.pdf
    • http://files.warfuelkitchen.com/uploads/1/3/1/8/131857562/7116007.pdf
    • http://files.marinegibert.net/uploads/1/3/1/3/131380953/7630616.pdf
    • http://files.hlaa-or.com/uploads/1/3/1/3/131380894/5906340.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7567/4014/files/12211681624.pdf
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/24733617218.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8584587797.pdf
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/renesu.pdf
    • https://jurikebigox883042776.files.wordpress.com/2020/06/83459552900.pdf
    • https://xubutamim.files.wordpress.com/2020/06/44178111872.pdf
    • https://xulesik.files.wordpress.com/2020/06/litupovolumujopu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/92161478626.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/pibik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wadilizesiwegokadokepub.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/dewid.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/mugufofaguposavokukiwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9285/files/23646074111.pdf
    • https://cdn.shopify.com/s/files/1/0430/6980/0597/files/mimeresanexalow.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_off0000707d.bin
444d04afc2506e15043cdf70edc59988f7d5c22a7355e7a56f44624a60974dfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707D 5496 bytes
font_01_sfnt_off00008313.bin
ec819dfb0b248a01d2c5c70daca3365e5725d79d32280104f700a757bc9111e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8313 10348 bytes

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