Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a557cefe711fc3d…

MALICIOUS

PDF

61.6 KB Created: 2020-08-08 00:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9d139b11b7fca1d9377681b8961657e SHA-1: 934048645a17064d13c6bb93d994ae83e8bcf5f3 SHA-256: 7a557cefe711fc3d06aba3bf44e451391b53dc8fb6a4a1bd11c58195bd7eddb8
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content.

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=arabic+numbers+1+1000+pdf
    • http://files.osgoodevillage.org/uploads/1/3/2/6/132681670/jakajixijifut.pdf
    • http://sexevoz.crotonlibrary.org/uploads/1/3/1/4/131407406/c0c59e8.pdf
    • http://files.thepowerisyou.com/uploads/1/3/1/4/131453429/mesarup.pdf
    • http://files.jonrawlingsphotography.com/uploads/1/3/0/8/130813992/4406a1f5108.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/niposixapogimita.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/tojawarutofejugotapeje.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9759/files/sewing_machine_repair_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8402/files/23404345121.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/basugogigarerebid.pdf
    • https://cdn.shopify.com/s/files/1/0437/8414/3010/files/3230428914.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/80202150329.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1555/files/11256997902.pdf
    • https://cdn.shopify.com/s/files/1/0432/5664/3739/files/88330071346.pdf
    • https://cdn.shopify.com/s/files/1/0432/5048/3368/files/minecraft_wheat_farm_design.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7872/files/44452862204.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000bbf8.bin
24d4b7698d3672aec767c38fded99ef4b6c7cb18262625afddbfb62a7f8ad609		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBBF8 24940 bytes
font_00_sfnt_off00007d48.bin
9f37bae02dbef2595a76439291193cba9ebdb2ba758771a7c50fff6448034fc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D48 5592 bytes
font_01_sfnt_off00009032.bin
c3eac405a3a50f908a43014019e6e0defdd7014e739d818f67460c2ede060891		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9032 14492 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.