Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd83d41283e55977…

MALICIOUS

PDF

52.5 KB Created: 2020-08-21 11:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fef2e927758a79185d0e1ec6165ed27 SHA-1: df01be53b09806d99e9a9a3c57db292d479f547d SHA-256: fd83d41283e55977b077bd0c7ec1ee43cc96544dccbfdfd2c3cd2be55ad0190c
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a guide for a 'blackjack game app for android'. The PDF also hosts a large number of external links, many pointing to Shopify, likely for SEO manipulation to improve the ranking of the malicious redirector. The ML classifier strongly indicates maliciousness.

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=blackjack+game+app+for+android
    • http://lugif.luredbythebead.com/uploads/1/3/1/4/131407995/3360846.pdf
    • https://cdn.shopify.com/s/files/1/0464/7688/6168/files/bjj_gi_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52657742202.pdf
    • https://cdn.shopify.com/s/files/1/0436/9675/0742/files/fusobegofejerovegigimaru.pdf
    • https://cdn.shopify.com/s/files/1/0428/1905/9868/files/57060141444.pdf
    • https://cdn.shopify.com/s/files/1/0450/9057/0405/files/compress_mac_software.pdf
    • https://cdn.shopify.com/s/files/1/0438/0357/4432/files/21667850129.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7020/files/54324100947.pdf
    • https://cdn.shopify.com/s/files/1/0434/2897/0647/files/pip_install_pypdf2_syntaxerror_invalid_syntax.pdf
    • https://cdn.shopify.com/s/files/1/0448/3081/8461/files/read_assets_android_xamarin.pdf
    • https://cdn.shopify.com/s/files/1/0431/5181/8903/files/vinatimiliwisefumozuva.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/hbr_guide_to_data_analytics_basics_for_managers_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/mufog.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_off00008f0c.bin
2db57ba9df689231307a64fc434782487122f85b6df3e0e0967b58781f0c279a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F0C 5484 bytes
font_01_sfnt_off0000a1ac.bin
299857c7dbdefa17858bca8b4d80b900501e69d754a912c260e70695f16ed899
pdf-font-stream PDF embedded font (sfnt) at offset 0xA1AC 10364 bytes