Malicious PDF — malware analysis report

Static analysis result for SHA-256 827f093a7e3b05ef…

MALICIOUS

PDF

40.7 KB Created: 2020-08-10 19:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19624ceaa94a7242b1595edcedce4251 SHA-1: 210a12f1ea0754b66821abb5eb9cfbb22c738a5d SHA-256: 827f093a7e3b05efb5d03abc14c4992ed89ddcad794122166ca8b1eed273314f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains a large number of embedded links, identified as a link farm, pointing to various PDF files hosted on Shopify and other domains. One of the primary links directs to a known malicious redirector, suggesting a malicious intent to distribute further content or malware. The document body, though heavily obfuscated, contains a URL that mirrors the redirector link, reinforcing the malicious nature of the document.

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=differential+calculus+formula+pdf+download
    • http://files.artexpressions218.com/uploads/1/3/0/9/130969535/73c12a07e.pdf
    • http://files.writteninwood.com/uploads/1/3/0/7/130776204/8112700.pdf
    • http://files.lifechurcheu.com/uploads/1/3/0/8/130874332/lawoxawepowip_rubokuvemanaluj_fuvozopolaj_fowiwobenut.pdf
    • http://files.zoe-farmer.com/uploads/1/3/1/4/131454549/runavar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4299/5352/files/xodanodu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1917/2000/files/kowafalefokemudenugoweko.pdf
    • https://cdn.shopify.com/s/files/1/0432/8790/4422/files/47926271486.pdf
    • https://cdn.shopify.com/s/files/1/0439/2160/4763/files/3652224693.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18491093394.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/82968275358.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/55440015196.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/refazawoxud.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9069/files/babumebaxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/tedebo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/zener_diode_circuit_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/gekuvotolujasikopokum.pdf
    • https://cdn.shopify.com/s/files/1/0439/6145/0654/files/beej_socket_programming_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6992/files/zobimotizeneponiwilib.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_off00005d75.bin
020ec5709720678864df02e7597e1b3a75b59fb1745aecb958be27ea92ee4f3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D75 5392 bytes
font_01_sfnt_off00006fc8.bin
ae54bdaa97250f66a22dc66048f375513ee436cc0aeb042132acb0b22ed2bcaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC8 11584 bytes

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