Malicious PDF — malware analysis report

Static analysis result for SHA-256 199451eb5d6df861…

MALICIOUS

PDF

46.7 KB Created: 2020-08-29 08:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b44688e97f6e5b3ac30c4542d41e7ae6 SHA-1: eeb15652b0ba5babeba8050e789d8e1e262c5256 SHA-256: 199451eb5d6df8613c0e8968fe48d9d261dd48ee0b80c78eab41683f68e1d5b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=fpse+activator+apk'. This suggests an attempt to trick users into visiting a malicious site, likely for further exploitation or credential harvesting. The presence of many links, including to benign Shopify URLs, indicates a link farm strategy to obscure the malicious destination. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.ru/wix?keyword=fpse+activator+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/7338/9223/files/english_to_bengali_dictionary_free_download_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/wadem.pdf
    • https://cdn.shopify.com/s/files/1/0454/2994/8572/files/excel_dart_cricket_score_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/3080/4642/files/word_file_to_converter_app_for_pc.pdf
    • https://static.usrfiles.com/ugd/b8c837_c46f24c89bcd4c8dbcbdab24d4361b14.pdf
    • https://static.usrfiles.com/ugd/b8c837_146b08c34cde469494a55c87ba4bcac1.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d1e35c3c613448882a11ca4a22253f1.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/88921424456.pdf
    • https://cdn.shopify.com/s/files/1/0441/0851/3432/files/cuneiform_fracture_cpt_code.pdf
    • https://cdn.shopify.com/s/files/1/0436/7086/4025/files/26634656162.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/dukudosi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/kiwegibon.pdf
    • https://static.usrfiles.com/ugd/b8c837_936e6d706b1745e681c286eb4167454a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d86637aaf80a4a9192bfc9526af3486e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1203834decad448b98ae5f210da8ec49.pdf
    • https://static.usrfiles.com/ugd/b8c837_2514bf244c0642bd965e8c4b80d22643.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c2b.bin
b7d761dfc3253d2d80aaa30f806e6c2d8aa60f91c27b1bdc401bd33ad6662dcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2B 4656 bytes
font_01_sfnt_off00007c16.bin
37dd04958d758f385a4961a008641fdf6ac5aa33a514072eea2d3d6a1673cfa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C16 10680 bytes
font_02_sfnt_off00009ffa.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FFA 4324 bytes

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