Malicious PDF — malware analysis report

Static analysis result for SHA-256 eddab1ec4b33a336…

MALICIOUS

PDF

34.8 KB Created: 2020-08-05 01:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f481367d68ecad5c213c8fefceeb13f8 SHA-1: dcbe35b94aa135032bdba3d28e36185391f33f78 SHA-256: eddab1ec4b33a3366b317d978d999e4403e21c3e043d938ce937cb4f754850df
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a document about 'sociologia urbana manuel castells'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly supports the malicious nature of the file. The document body, though heavily obfuscated, contains the suspicious URL and references to other PDFs hosted on Shopify and other domains, suggesting a link farm or redirection scheme.

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=sociologia+urbana+manuel+castells+pdf
    • http://files.maggietate.com/uploads/1/3/1/4/131406104/zaxopisulizaverobap.pdf
    • http://files.museumrussianlacquer.com/uploads/1/3/1/3/131378990/taxixusimofojim-kurudulizonin.pdf
    • http://files.mydbcommunity.com/uploads/1/3/2/6/132695511/2178850.pdf
    • https://cdn.shopify.com/s/files/1/0433/8978/0124/files/40931073608.pdf
    • https://cdn.shopify.com/s/files/1/0431/7895/0810/files/witusupixuva.pdf
    • https://cdn.shopify.com/s/files/1/0429/3656/5923/files/47387598901.pdf
    • https://cdn.shopify.com/s/files/1/0433/4823/0297/files/dd_362.pdf
    • https://cdn.shopify.com/s/files/1/0433/4800/0922/files/78031100540.pdf
    • https://cdn.shopify.com/s/files/1/0429/2696/4903/files/homestead_exemption_fulton_county.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/90232885568.pdf
    • https://cdn.shopify.com/s/files/1/0440/8344/5925/files/crimes_of_the_heart_beth_henley.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12091312038.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/pusimasoxizojopi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/zuzolexilevuxenuxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/nedivijikazarobegarezil.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_off00004a21.bin
31340093cd2670e126e146307f97f871872e6595d495a8d3c86c03b23222d35b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A21 5716 bytes
font_01_sfnt_off00005d7c.bin
3049a60dcd690cb7912fd045be848e0cdd5033166a8efe911df284b7f92b3615
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7C 9580 bytes