Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5c077b3d497fd5…

MALICIOUS

PDF

45.5 KB Created: 2020-08-21 12:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0ad8078e7021b40e7faac3f4c98cc4f SHA-1: f8706d1fba8ca04ad419a7a812c813d0ae57bd32 SHA-256: 8c5c077b3d497fd5ffc17c16b43166b181fc7b7425a8cdd63657657115ae9303
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=convert+bitmap+into+base64+android'. This indicates the document's primary purpose is to redirect users to potentially harmful content. The presence of a large number of external PDF links also suggests a link farm or SEO poisoning attempt. 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=convert+bitmap+into+base64+android
    • http://files.sosobootcamp.com/uploads/1/3/0/9/130969494/4fe8b4de001dbd3.pdf
    • http://files.reneejackman.com/uploads/1/3/0/8/130873794/41f95bdb.pdf
    • http://files.mountainblueharmony.com/uploads/1/3/1/8/131871501/7983c555cf.pdf
    • http://paviruvej.1enchantedcraft.com/uploads/1/3/0/7/130738946/9edb1941dc277c.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/70439867193.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5885/files/93264185658.pdf
    • https://cdn.shopify.com/s/files/1/0435/8661/7501/files/b_lut_dn_s_nm_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3478/files/you_know_my_name_chris_cornell_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/kubawaguwepizepitowo.pdf
    • https://cdn.shopify.com/s/files/1/0439/3664/5275/files/noise_complaint_letter_to_council_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dijupabexapuvasazanuripik.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/bimevisifekupal.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3462/files/bedejuzoriruk.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/pfsense_freenas_jail.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/suxomokil.pdf
    • https://cdn.shopify.com/s/files/1/0434/8674/0646/files/windows_10_taskbar_color.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_off00006304.bin
a7c73f466ed92de963ca950556c1c95f89a578b22afad59da39fa53bdc222e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6304 5328 bytes
font_01_sfnt_off00007505.bin
d56724416af2d9cf62e2689606d6e4b3e08ef03106a2d3507c2315bfed72f264		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7505 11656 bytes
font_02_sfnt_off00009af7.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF7 4324 bytes

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