Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cef0254d384c3c…

MALICIOUS

PDF

43.9 KB Created: 2020-08-23 08:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef16c5902f355cf84ae64da1b651c55c SHA-1: a6def6682a3dbac6d77ebb7cef8939380afa2ef3 SHA-256: 72cef0254d384c3c027c28205fb035949cd5293b28f3ecc1e25adbf5f5de21c8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The document body itself is heavily obfuscated and contains the primary malicious URL.

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=aloe+blacc+love+is+the+answer
    • http://veronekip.horizongirlscouts.org/uploads/1/3/1/4/131407057/nunumoziso.pdf
    • http://files.tactdrama.com/uploads/1/3/1/3/131398184/ddee889710029.pdf
    • http://jeval.milazanenyc.com/uploads/1/3/0/9/130969742/kawalepuwesalav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/osrs_monkey_madness_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/6500/7509/files/53715782376.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81256704061.pdf
    • https://cdn.shopify.com/s/files/1/0437/0219/0235/files/automata_theory_tutorials_point.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/fb_messenger_uptodown.pdf
    • https://cdn.shopify.com/s/files/1/0434/2556/2785/files/calendario_2020_por_mes_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0431/3530/3831/files/wamujakugenenudonoku.pdf
    • https://cdn.shopify.com/s/files/1/0428/5448/2079/files/85738056188.pdf
    • https://cdn.shopify.com/s/files/1/0438/5089/1424/files/biology_dictionary_for_high_school.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a44.bin
1f3f50d5d5e7467ac0fce248e4d651e459e6a32eb9c9a5e070f234d2624efef3
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A44 10900 bytes
font_01_sfnt_off00006d7b.bin
6a04406d41f4a122594e0d352c9de688e5b972f5422f4c88809cfe66e437c99a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7B 5168 bytes
font_02_sfnt_off00007f13.bin
fc6a841254dafdd807f4eb1ff698661332ae93a5dca8178e17d21d6d6f5e7e6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F13 10704 bytes