Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f425f6422b49be2…

MALICIOUS

PDF

43.7 KB Created: 2020-08-16 15:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f10329e6a269ceabcb2ca13ce4e54aa4 SHA-1: 1cf755445cd786089e1efcd963e98204e8f746cd SHA-256: 3f425f6422b49be25ce05ad0ccb900e49fdc8271f32f212a8f2c58e798f93f53
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'receipt spreadsheet template' and the malicious URL. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be a lure to a malicious redirector.

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=receipt+spreadsheet+template
    • http://files.belfastarearentals.com/uploads/1/3/0/7/130740490/nugera.pdf
    • http://files.edenlankaholidaytours.com/uploads/1/3/1/1/131164124/9bd86503af.pdf
    • http://zomapugi.ecpopwarner.com/uploads/1/3/1/4/131409090/xovutewox.pdf
    • http://rakug.academictranscripts.com.au/uploads/1/3/0/7/130739063/63ca7174d5ae864.pdf
    • https://cdn.shopify.com/s/files/1/0450/0901/0852/files/cours_alphabtisation.pdf
    • https://cdn.shopify.com/s/files/1/0428/6201/8716/files/periodontal_disease_and_diabetes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2914/files/65934841800.pdf
    • https://cdn.shopify.com/s/files/1/0435/0859/6900/files/hillsong_united_songs.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/65036641997.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27392185694.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4245/files/cell_counter_imagej.pdf
    • https://cdn.shopify.com/s/files/1/0435/3025/6536/files/48951658785.pdf
    • https://cdn.shopify.com/s/files/1/0430/0508/3811/files/rezulimivarimexuxabubib.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_off00006d07.bin
9187ac162eea24f6023860d2f2518db92e203025a2867bfd953ea01c66264c53
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D07 5320 bytes
font_01_sfnt_off00007ef2.bin
fb5d4b269d76aaae18d530b737bf5e715b09449b6216d9e99cf372a4f39749ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF2 10308 bytes