Malicious PDF — malware analysis report

Static analysis result for SHA-256 925b1a2bf25f4455…

MALICIOUS

PDF

36.7 KB Created: 2020-08-20 06:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 256794ed658993a8150b5671c568cca5 SHA-1: 2fa589db8ca76809a7f1be61f16defe95fee1bad SHA-256: 925b1a2bf25f445503c9e70d757249a28c4b5d017766af5861dc5ab8f2f1fb9c
154 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a large number of external links, many hosted on cdn.shopify.com, suggesting a link farm designed to obscure the ultimate destination. The primary malicious URL identified is https://ttraff.com/pify?keyword=manual+fog%25C3%25A3o+brastemp+gourmand+vapor, which likely serves as a gateway to further malicious content. No scripts were extracted from this sample.

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=manual+fog%25C3%25A3o+brastemp+gourmand+vapor
    • http://files.unitethevillage.org/uploads/1/3/1/3/131380539/jizelolobi_xabob_kijedasuboba.pdf
    • http://besag.asiacontentmarketing.net/uploads/1/3/1/4/131437064/zasetifosefiliw-sujizogifabisa-lefuxot.pdf
    • http://files.gregwhite76.com/uploads/1/3/0/9/130969761/8af5f9428d5087.pdf
    • https://cdn.shopify.com/s/files/1/0434/5357/9430/files/59837697862.pdf
    • https://cdn.shopify.com/s/files/1/0446/6864/9625/files/best_reader_app_for_windows_8.pdf
    • https://cdn.shopify.com/s/files/1/0440/7289/4629/files/5910660234.pdf
    • https://cdn.shopify.com/s/files/1/0440/4104/4118/files/neuroblastoma_practice_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0439/0364/7912/files/fnaf_4_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6201/files/algebra_2_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/zilelupevo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4256/2460/files/88139902533.pdf
    • https://cdn.shopify.com/s/files/1/0437/0523/7657/files/81459477936.pdf
    • https://cdn.shopify.com/s/files/1/0432/0939/2285/files/betaxiduzexegakugefadel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0432/9714/4990/files/jakejozusajir.pdf
    • https://cdn.shopify.com/s/files/1/0433/7562/4350/files/kuziguzezovivej.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_off00004d4f.bin
6f32498c10aba04f2362836913d36cce69e252876923dcf08322639b9dace088		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D4F 5884 bytes
font_01_sfnt_off000060b6.bin
d04a354b5cf6ddf9201896486b4779ca50610a259f2eadacc2a4ed9c571bb443		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B6 10172 bytes

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