Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3598e12a20e86a7…

MALICIOUS

PDF

46.4 KB Created: 2020-08-25 02:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebb5608e4203acc71eb3e3a82ccf8448 SHA-1: 0f926e5c735532e757200a2310d1eab1fd89c916 SHA-256: d3598e12a20e86a76f1a50dc68a3530a676698342ccb7cecf9245cbfa0921845
130 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains a reference to 'grammar checker free for iphone' and the malicious URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on cdn.shopify.com, likely to improve search engine ranking and distribute the malicious payload.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=grammar+checker+free++for+iphone
    • http://files.mod-mode.com/uploads/1/3/1/4/131454035/tunusad_nowitir_ragadozulez_leneri.pdf
    • http://files.ericmccarron.com/uploads/1/3/0/8/130874382/3594543.pdf
    • http://files.wilsoninteriordesign.com/uploads/1/3/0/7/130738512/f9806094a8.pdf
    • https://cdn.shopify.com/s/files/1/0437/1356/0727/files/19994570642.pdf
    • https://cdn.shopify.com/s/files/1/0433/8040/8474/files/kigipowigibelogemali.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/bestimmte_und_unbestimmte_artikel_bungen.pdf
    • https://cdn.shopify.com/s/files/1/0431/6682/6656/files/atomic_habits_vk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0163/4213/files/alcoholic_whatsapp_status_video.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdf
    • https://cdn.shopify.com/s/files/1/0434/3375/4773/files/bpp_f2_study_text_2020.pdf
    • https://cdn.shopify.com/s/files/1/0464/0948/2408/files/francis_bacon_essays_of_studies.pdf
    • https://cdn.shopify.com/s/files/1/0454/2958/8124/files/71604117507.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3841/files/fomide.pdf
    • https://cdn.shopify.com/s/files/1/0434/8959/1461/files/302880106.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_off00006ab4.bin
ca44c6e6da930a7da23c6aa2ac16bca58d3754a022cd70883c0365ebf241b448
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB4 4848 bytes
font_01_sfnt_off00007afe.bin
7cd872bef4d31961840e760783b23019702158d551b089a03d62e00b407d216d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFE 10352 bytes
font_02_sfnt_off00009e29.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E29 4324 bytes