Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5762e3c704c8642…

MALICIOUS

PDF

46.2 KB Created: 2020-08-03 19:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2c324f78e4847bc896820da0689c805 SHA-1: 55ac4a7e7b3cef0cab88cc32721303fa9242f05b SHA-256: c5762e3c704c864201667b89e9aa7e955522d177d8c191365dac37eb8a6808e8
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded external links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The presence of a link to a known malicious redirector (ttraff.cc) strongly suggests a malicious intent to lead users to harmful content. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the sheer volume of links and the malicious redirector indicate a likely phishing or content-serving lure.

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=acetilcolina+que+es+pdf
    • http://files.theoverflowing.com/uploads/1/3/1/8/131871439/sojegun-guvepumavigabo-xojofarekuva-tikog.pdf
    • http://files.thepeppypoppy.com/uploads/1/3/1/3/131382590/nidaweluxoxiz.pdf
    • http://files.annishealinggarden.com.au/uploads/1/3/0/7/130776864/kuxafixogudaruwuje.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1547/files/paging_and_segmentation_in_os.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/twitch_founders_badge.pdf
    • https://cdn.shopify.com/s/files/1/0435/8579/8301/files/76697336775.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/57356161608.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/bomusomexezezotanezinaroj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6150/0318/files/oer_support_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9079/files/extended_forecast_for_vail.pdf
    • https://cdn.shopify.com/s/files/1/0435/6944/7073/files/tibekidafepafedawirirujut.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/winesisizowuxeladaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4156/files/60093906390.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/69276499004.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47878122177.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/fallout_new_vegas_realistic_damage.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_off0000731b.bin
e471f19b5fa8435bb3e69c2330c33925044e247291025bf6c2245b1e71416ad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x731B 5168 bytes
font_01_sfnt_off000084cb.bin
d1aec306a96595d416cd9d26c8b8a5be8d7b97269c0bfefd7b06c7e57fb7501f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84CB 12036 bytes

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