Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84e83c1f5bf711c…

MALICIOUS

PDF

38.8 KB Created: 2020-09-05 06:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf5b4f6442230175aa6a46b39325b93a SHA-1: b1b048cc3f97bd6aeb11953a5df27cc76cc958ff SHA-256: f84e83c1f5bf711cd9a2ffc94e1c3e5161ceb557b3428386798f05e404909053
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a redirector URL associated with malicious activity. The document body, though partially corrupted, contains text related to 'Avengers 4 game apk', suggesting a lure to trick users into clicking the malicious link. The presence of a large number of external PDF links further indicates a link farm strategy, likely to improve SEO for the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.club/wix?keyword=avengers+4+game++apk
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/xiwegifumobobuzemavonel.pdf
    • https://cdn.shopify.com/s/files/1/0440/6139/3061/files/fobubiri.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/manaxuganopenu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/worcester_27i_system_boiler.pdf
    • https://cdn.shopify.com/s/files/1/0435/5332/5224/files/xufav.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_aa9343ffee104f8aa6723c986fdc2687.pdf
    • https://static.usrfiles.com/ugd/d99ef3_03633ee52e46411e85d75e5ef86d9b41.pdf
    • https://static.usrfiles.com/ugd/a2de88_9c79b02cd3d34139a306635faa95ef9c.pdf
    • https://static.usrfiles.com/ugd/fb5067_a85d0d27179a40b78ebcc7afefb0acca.pdf
    • https://static.usrfiles.com/ugd/fbccce_85e216a94a434e49b391f71bdf16bb76.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/jerokaki.pdf
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/buddhism_history_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/selege.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5609/files/vakafipinuwofad.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0441/files/icelandic_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0435/5679/8627/files/90801278085.pdf
    • https://cdn.shopify.com/s/files/1/0447/2376/5402/files/speed_velocity_and_acceleration_worksheet_with_answers.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_off000043b9.bin
7882fd99c89252fceb7be8e6762b4d9066640b0b3aa7760b536c611e065f7338
pdf-font-stream PDF embedded font (sfnt) at offset 0x43B9 4860 bytes
font_01_sfnt_off00005419.bin
8da8ba3ce4c293e4d1f3144659520e56df1e3eb967665beaf1212a8b36a1cdc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5419 13972 bytes
font_02_sfnt_off00007eb2.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB2 4324 bytes