Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da815c1699c8cac…

MALICIOUS

PDF

60.5 KB Created: 2020-08-18 19:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e86f100b61f2657e7776ba07bf77c379 SHA-1: 6b253613f225ab44ef2606317e15d8602d504521 SHA-256: 4da815c1699c8cacf8f07383893a7ab689a7cad046db2ec9bb431081ffe4dd15
154 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.cc' disguised as a lure for 'Netflix premium mod apk latest'. This URL is flagged as a malicious redirector, indicating the document's primary purpose is to lead users to malicious content. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious payload. The ML classifier strongly supports the malicious nature of this PDF.

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=netflix+premium+mod+apk+latest
    • http://files.citrus2030.org/uploads/1/3/0/8/130874567/7530163.pdf
    • http://files.wisdombytheletter.com/uploads/1/3/2/6/132682806/87017727277ddfe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5033/5384/files/wutazolokoxujo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3893/3146/files/mepifo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3481/files/ultimate_bearing_capacity_of_soil.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/76049406064.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/79848207931.pdf
    • https://cdn.shopify.com/s/files/1/0433/9836/5340/files/hydrolysis_of_esters_and_amides.pdf
    • https://cdn.shopify.com/s/files/1/0431/8058/9207/files/countable_and_uncountable_nouns_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/2478/5313/files/40322729566.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/linux_bash_scripting_tutorial.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008170.bin
4081e1a3e6f6ea3d0675b935761a9b1f39dd227f9fef2dd548cc70483e0ea8d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8170 5288 bytes
font_01_sfnt_off00009358.bin
1df77d16be7156084e8caff260e756c970f4813a3e676efd01c7eb4f898884cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x9358 2920 bytes
font_02_sfnt_off00009fca.bin
c894837a3b047641194dea38be4d1c59bdfce2354712667631999a59cd188b23
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FCA 16268 bytes
font_03_sfnt_off0000ce1e.bin
0c0c866866dfab579b577a19d82315916b4f4efc43366722b856ecaccd851ed9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1E 16720 bytes