Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a95ef0cac2733eb…

MALICIOUS

PDF

39.9 KB Created: 2020-08-06 16:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce32a918f4b6f8734a7fcfe076ae8409 SHA-1: 0ac98e189ac1feff56b9649fa098b8d78e1b9238 SHA-256: 5a95ef0cac2733ebd6476fa1d7cd9fb6c7850582196b2ae5b9d09612855d740c
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a link farm or SEO poisoning attack. The document body, though heavily obfuscated, contains text related to lyrics and PDF metadata, indicating a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs supports the attack pattern.

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/pify?keyword=achyutam+keshavam+lyrics+pdf
    • http://taganot.crowfootguitars.com/uploads/1/3/0/7/130776262/xejoxitosatomogivi.pdf
    • http://todemawu.prestopreservation.com/uploads/1/3/0/7/130738524/koxubumasataba-nodekukivixalug-zamunegosilul-selitidewutuvif.pdf
    • http://files.danceworksenid.com/uploads/1/3/2/3/132303410/xibinokudenolunafoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/wowipenegijesozajejolepem.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/35685559578.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1040/files/11855508017.pdf
    • https://cdn.shopify.com/s/files/1/0433/9089/4247/files/3812409689.pdf
    • https://cdn.shopify.com/s/files/1/0433/3935/0181/files/74510333048.pdf
    • https://cdn.shopify.com/s/files/1/0434/9453/9429/files/maplelegends_bishop_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/fresco_logic_usb_display_driver.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7319/files/44882157670.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90841244024.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_off000054c9.bin
d400ee8758054e4a54398002e2505552bcd9c50d6fba8e6995d62341560f6297
pdf-font-stream PDF embedded font (sfnt) at offset 0x54C9 5608 bytes
font_01_sfnt_off000067c2.bin
922909198c953e057140a400af0aff1ebdfb1052604488ca79c5d51c16c1932e
pdf-font-stream PDF embedded font (sfnt) at offset 0x67C2 14008 bytes