Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3eba280b9ab6b43…

MALICIOUS

PDF

51.6 KB Created: 2020-08-10 20:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fae9fca6230b1be9a89b55fcacad3426 SHA-1: 4dd57f8a1a70da16ae379201a3658785c2523fd3 SHA-256: c3eba280b9ab6b438cb5278d754108dadc357a7df51ae383d1cf908eba509c69
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, 'https://ttraff.ru/pify?keyword=contador+publico+definicion+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other potentially malicious links, suggesting a phishing or redirection scheme. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=contador+publico+definicion+pdf
    • http://xidep.tulipcity.org/uploads/1/3/1/6/131637814/nuwukuges_kotiliwuxituxal_sevajajupoxe.pdf
    • http://files.austlinq.com/uploads/1/3/0/7/130739779/eb2e7bfbfca.pdf
    • http://files.huntingdonbedandbreakfast.com/uploads/1/3/1/4/131452958/tokuwoxu_veselelolabot.pdf
    • http://files.needsmacnow.com/uploads/1/3/1/4/131454165/4285740.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/pcat_practice_questions.pdf
    • https://cdn.shopify.com/s/files/1/0435/7747/5233/files/alelos_mltiplos.pdf
    • https://cdn.shopify.com/s/files/1/0436/9462/0837/files/wisipop.pdf
    • https://cdn.shopify.com/s/files/1/0432/0631/2098/files/43920014618.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zixetirubopejama.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/59504079305.pdf
    • https://cdn.shopify.com/s/files/1/0440/3114/8197/files/les_capteur_de_temprature.pdf
    • https://cdn.shopify.com/s/files/1/0440/8328/2070/files/nosixafusizorujo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0938/4343/files/55777910214.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/john_deere_rx75.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/berserk_of_gluttony_indo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3458/2938/files/6287598226.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9277/files/28574195564.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008be5.bin
fcabc4db8e34a3bfd5537dbeec5cbcc50972990867f4c2180e39da01b1c9bed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE5 5016 bytes
font_01_sfnt_off00009cf9.bin
5d1f58ef790d132d473058a0a736b627928550454183d80291f324511f531eb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF9 10596 bytes

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