Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad05d19f55ab2e68…

MALICIOUS

PDF

72.3 KB Created: 2020-08-12 22:39:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed20685dbeb01e35820bb6312b336a55 SHA-1: e54c2834af92ac1261d3bac5c8ef92b535b34203 SHA-256: ad05d19f55ab2e68390d49c88af9f1d3101f86bde50909403d17b49541b738f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, another critical heuristic indicates a PDF link farm, with the primary link also leading to 'ttraff.com'. The document body, though heavily obfuscated, contains the URL and keywords suggesting a lure for a guitar tutorial. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a malicious link embedded within the document.

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/wb?keyword=lead%20guitar%20tutorial%20pdf
    • http://files.eldoradocartersville.com/uploads/1/3/0/8/130813841/ridupot.pdf
    • http://files.annlansingphotography.com/uploads/1/3/2/8/132814123/896113.pdf
    • http://files.yourwshop.com/uploads/1/3/1/4/131437376/puzukono.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/lotaki.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0154/files/22153714321.pdf
    • https://cdn.shopify.com/s/files/1/0434/7176/5664/files/cervical_radiculopathy_home_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0436/2135/1587/files/icar_answer_key_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/additional_mathematics_text_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/6624/4764/files/modelo_biopsicosocial_en_trabajo_social.pdf
    • https://cdn.shopify.com/s/files/1/0428/4078/5062/files/absli_wealth_secure_plan.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/duselorawovezakon.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/12254857964.pdf
    • https://cdn.shopify.com/s/files/1/0433/9289/3093/files/is_11513_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/3517/1738/files/additive_manufacturing_technology_applications_and_research_needs.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/21709275159.pdf
    • https://cdn.shopify.com/s/files/1/0433/0281/3849/files/wutojasepebijum.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
font_00_sfnt_off0000d6a7.bin
ded9261dc95099bf57908fbed0daf3642272e8318243add1d73eb4e6d818c8ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 4972 bytes
font_01_sfnt_off0000e79a.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 1800 bytes
font_02_sfnt_off0000f028.bin
81978e6572e181271211e6037426d248fd6d071180cf8b2bd3f57b560681c184		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 10352 bytes

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