Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d56911881f615a2…

MALICIOUS

PDF

40.1 KB Created: 2020-08-10 11:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ad9d89b52c6195ad26e34190dee44e2 SHA-1: 271369c3d8785c7986be3253c7939ee71b4e63c3 SHA-256: 7d56911881f615a27d9cccd2678f5d2ce8a5c67152a92999c6329fe965f2e03b
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which are part of a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which likely serves as the initial stage for delivering malware. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the extensive link farm and redirector suggest a phishing or malware distribution attempt.

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=associer+plusieurs+pages+pdf
    • http://files.ricepaperdesigns.com/uploads/1/3/1/4/131438044/dobebogobev_nonopir_potiji_dufelil.pdf
    • http://files.tambowthewombat.com/uploads/1/3/0/8/130874485/5022749.pdf
    • http://lusugaxo.theoaksmith.com/uploads/1/3/1/3/131383483/7e0764c0d231.pdf
    • https://cdn.shopify.com/s/files/1/0432/7741/8656/files/52681448401.pdf
    • https://cdn.shopify.com/s/files/1/0434/6563/8050/files/simplesmente_acontece_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5624/files/blickle_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/network_technician_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0432/5736/4638/files/wufurufimajifetod.pdf
    • https://cdn.shopify.com/s/files/1/0430/9847/2605/files/506_assignment_answer_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0429/3902/3526/files/54871160681.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/monanizasora.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/40352754902.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1573/files/danny_phantom_episode_1.pdf
    • https://cdn.shopify.com/s/files/1/0439/5368/4638/files/87261758263.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/56407527028.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_off00005d88.bin
91a15e7009359986b721c9ffe54ca5f359c2f26a01d89f264360c1458d46291c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D88 5312 bytes
font_01_sfnt_off00006fa9.bin
2d4b10ce075ae0253d981d0b58453279abd370467d40b7137caaa0f979548468
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA9 11352 bytes