Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2aaa70ae3cf5f6b…

MALICIOUS

PDF

44.0 KB Created: 2020-08-22 20:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15e9681bc3c33b8928e0b6df1b3c8a0c SHA-1: 676c6dc025c65950a7a4cd443c909b66c3b40ad5 SHA-256: c2aaa70ae3cf5f6bb91418c07292f933d4c983cabf1a0122a1ffcd165a4fc9c2
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing its malicious intent.

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=3d+bus+driving+games++for+pc
    • http://files.lrhelpinghand.com/uploads/1/3/1/3/131380440/xopexuzirofib.pdf
    • https://cdn.shopify.com/s/files/1/0434/8284/1250/files/29922950606.pdf
    • https://cdn.shopify.com/s/files/1/0437/1746/0120/files/introduction_to_analytical_chemistry_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0452/7711/8625/files/free_fire_battle_royale_pc.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/poxurudoraduwevesorodukod.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/sotikevavuferogi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7073/files/pisovagowunudinedexeniw.pdf
    • https://cdn.shopify.com/s/files/1/0434/1812/4445/files/favozasulog.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/hipotiroidismo_en_el_embarazo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8063/7861/files/gimipib.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/38824665160.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_off00006ca4.bin
ce32add5eb3a7a310a3aa51bd9e40c95be088c8771e7e425711be7100f943087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA4 5712 bytes
font_01_sfnt_off00007ffb.bin
413bed543668a702a8b33f228377950816105dcae6c2f254deb30c8edf58e38a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFB 10512 bytes

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