Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a76971995061d3…

MALICIOUS

PDF

49.0 KB Created: 2020-08-10 04:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94a52e28498f7afec5b98eb47ef3c398 SHA-1: 6a70be24d3e3b9cef636382cc6ef6aa2f36619a7 SHA-256: 02a76971995061d362643bd97dab075ae80e333b0c9be4f8d13b43cb1fe721d5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) known for malicious activity. The document body, though partially corrupted, contains text related to 'C programming notes pdf free download' and a URL that aligns with the redirector heuristic. The ML classifier also strongly indicated maliciousness. The presence of numerous Shopify links, some marked as benign, suggests an attempt to blend malicious links with seemingly legitimate ones.

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=c+programming+notes+pdf+free+download
    • http://files.baldmanandhumans.com/uploads/1/3/2/7/132710797/9194127.pdf
    • http://wegukuloz.christianhartsough.com/uploads/1/3/1/4/131454065/tamuwowow-toxer-xivakizaf.pdf
    • http://kerejiju.buespta.org/uploads/1/3/1/4/131437792/955347b681bbb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/tecnologias_emergentes_en_alimentos.pdf
    • https://cdn.shopify.com/s/files/1/0433/7542/7735/files/49484058609.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4440/files/aprender_a_dibujar_superheroes.pdf
    • https://cdn.shopify.com/s/files/1/0434/3257/5132/files/21840998665.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/66497623815.pdf
    • https://cdn.shopify.com/s/files/1/0432/1538/8840/files/isolation_of_plant_pathogenic_bacteria.pdf
    • https://cdn.shopify.com/s/files/1/0433/8604/4572/files/rozekisatovegawux.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7599/files/jevedu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/bisum.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/lafivozojebaxejarozapo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4030/1478/files/28321438630.pdf
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/38387838960.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069a5.bin
183afa31b22ae5395a5e2548959b319928fbab56c6894c4868ebc7c26b4d5126		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A5 5356 bytes
font_01_sfnt_off00007bda.bin
46692ec8263cead3b434f6b021ab9cc0e64ae3da622d9c3fa60fee9f77bf1f75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDA 10604 bytes
font_02_sfnt_off0000a022.bin
8de793b06b64a3af4043fab5989a82f586877c93faf3df4ddeb26e4bda582bba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA022 16828 bytes

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