Malicious PDF — malware analysis report

Static analysis result for SHA-256 194b03fd2b4dba9c…

MALICIOUS

PDF

49.2 KB Created: 2020-08-23 13:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b34eaa2af4287a0f61f1c75f66729144 SHA-1: 476d379157048e119b8c17ceccf9fda308cd8cbc SHA-256: 194b03fd2b4dba9c277c2459d9c21c7fea28c75bffb92c2119bb56101ff5ca12
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a PDF related to grammar exercises, likely a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external PDF links suggests a link farm or SEO poisoning attempt 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.ru/pify?keyword=integrated+grammar+exercises+for+class+10+pdf
    • http://files.yschemenauer.com/uploads/1/3/2/6/132695615/6297967.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/jekuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/9291/6891/files/petiwosurolapuze.pdf
    • https://cdn.shopify.com/s/files/1/0434/3834/2311/files/siribuzibojowozifegi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/90732072269.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4748/files/marine_biology_textbook_high_school.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7397/files/black_sheep_cycling_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/6338/4991/files/how_to_improve_your_discord_server.pdf
    • https://cdn.shopify.com/s/files/1/0462/2925/8389/files/88119282247.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/programming_directv_remote_to_vizio.pdf
    • https://cdn.shopify.com/s/files/1/0434/4233/9992/files/84931339180.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eae.bin
997a2073921d134ade4d6ab0f09635731cd1faae79d4bc6ac9f0929427646fe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAE 5460 bytes
font_01_sfnt_off00007125.bin
432b1bdaf9a976aaa7fd99a6635352bfe19ab16787b7b4427147c648404cdd4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7125 10276 bytes
font_02_sfnt_off00009470.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9470 16164 bytes
font_03_sfnt_off0000a985.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA985 4324 bytes

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