Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d31cd9dc39673e1…

MALICIOUS

PDF

43.7 KB Created: 2020-08-06 16:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2d78f437f53b6087e799e6a200a304e SHA-1: 68853e0b82793c18ea90e11bfa0c312fbdc3620d SHA-256: 8d31cd9dc39673e1dc8c2ec303dbd5d3e03b40646f4a8e8b1efd164f12f530d1
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Cinderella short story with pictures pdf' and the malicious URL, suggesting a lure to a malicious site. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a malicious URL.

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=cinderella+short+story+with+pictures+pdf
    • http://files.stellastonesandjewelry.com/uploads/1/3/0/7/130739601/midetu.pdf
    • http://gobuzoj.reddeeraircadets.com/uploads/1/3/0/8/130874631/e7fcbf7793.pdf
    • http://files.crescentmoonconjure.com/uploads/1/3/0/8/130814085/begenagikibegeguwul.pdf
    • http://files.vankleekhillnaturesociety.org/uploads/1/3/1/1/131164351/3be2b644629bcdd.pdf
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/blue_exorcist_movie.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/megojaxiredaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5890/files/90467025154.pdf
    • https://cdn.shopify.com/s/files/1/0440/7646/6328/files/ziviwezu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3571/3958/files/42156294902.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/76086216744.pdf
    • https://cdn.shopify.com/s/files/1/0440/0198/4662/files/20668126306.pdf
    • https://cdn.shopify.com/s/files/1/0431/2009/9488/files/maxovuxegodosabemiwig.pdf
    • https://cdn.shopify.com/s/files/1/0431/3668/0098/files/mumikajomiromo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/20145450690.pdf
    • https://cdn.shopify.com/s/files/1/0438/0426/2561/files/82246292312.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40429789840.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_off00006a37.bin
55758d15e0b5fbe5de863961523ca65fbdfe4e735b6643cf20f5232878c004ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A37 5344 bytes
font_01_sfnt_off00007c70.bin
0d00e914085253ec7d78f60fb5e540cc68cf515c48f48c89fd6aebfb14c5268b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C70 10872 bytes