Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef40b492bd1952d…

MALICIOUS

PDF

39.2 KB Created: 2020-08-04 18:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afd9de974e158a9b0cfca8fb699fe30a SHA-1: 91b676c3c809434ffa10f5ab246b3d01605f7fec SHA-256: 0ef40b492bd1952d3995b0602c8868c2b21257293454ff991ff1787a32746d77
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to a malicious URL, indicating an attempt to lure users to a harmful site. The embedded content, though obfuscated, includes the malicious URL and references to other PDFs, suggesting a phishing or scam attempt. The ML classifier strongly supports the malicious verdict.

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=exercice+verbe+etre+et+avoir+au+pr%25C3%25A9sent+pdf
    • http://files.blondiesboutiqueshop.com/uploads/1/3/1/3/131384468/b65c2f47d4f6.pdf
    • http://files.prime-peak.com/uploads/1/3/0/7/130775518/jibasaj_kaluwoje_nagop_fakeremuv.pdf
    • http://rolofajuw.stnicholaschurch-shepperton.org/uploads/1/3/2/6/132682327/5715403.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/52180695239.pdf
    • https://cdn.shopify.com/s/files/1/0437/5740/4318/files/52199346737.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/wisutunerepipometazoveduv.pdf
    • https://cdn.shopify.com/s/files/1/0437/5832/1821/files/tirokiginikivojijekure.pdf
    • https://cdn.shopify.com/s/files/1/0430/3847/4397/files/60687232429.pdf
    • https://cdn.shopify.com/s/files/1/0432/2787/3440/files/sakedobizutapone.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6117/files/82595349596.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/komakuga.pdf
    • https://cdn.shopify.com/s/files/1/0428/2764/5095/files/mitosis_cell_cycle_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/roxofedezuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/4926/3004/files/24465752085.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_off000055ac.bin
86b22fe44264ee6c79b0e601b20c0210860b232c54649348f6e200be6f948dcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x55AC 5484 bytes
font_01_sfnt_off0000682c.bin
83236009edd7105ded2c79d9f50a5e6899c33626f5d015a04f5d796e0bd54153
pdf-font-stream PDF embedded font (sfnt) at offset 0x682C 11660 bytes