Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ad5e84cf44ef9a…

MALICIOUS

PDF

42.5 KB Created: 2020-09-10 09:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e89a121ced5007780d5a4f1f2c1d75e SHA-1: 670e23d8544359ec1abead73f9836adb06ab9787 SHA-256: f3ad5e84cf44ef9a90e31b6715ff6a196aba902a4249c22f3d811707a0afb6c7
120 Risk Score

Malware Insights

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

The PDF document contains a mass external link farm, with the primary link directing users to 'https://ttraff.link/wix?keyword=aptoide++apk+per+ios'. This redirector is flagged as malicious. The document body text, though heavily obfuscated, also contains this URL, reinforcing the lure. The presence of numerous links to static.usrfiles.com suggests a coordinated effort to distribute content, likely malicious, through a link farm strategy.

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.link/wix?keyword=aptoide++apk+per+ios
    • https://static.usrfiles.com/ugd/ee4d88_81f838cdad804afa9fe060ef54dffd9b.pdf
    • https://static.usrfiles.com/ugd/9c0842_db8e5f3894734b388008f9525d2c82bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_6dec77c6d46b470ea3f56922e1c7dda0.pdf
    • https://static.usrfiles.com/ugd/e1c37d_221ffb7a860c46e7ac65c05c9ed1bbd9.pdf
    • https://static.usrfiles.com/ugd/3d0627_034a8acaa0034d1282e632482bbdbf60.pdf
    • https://static.usrfiles.com/ugd/4d400c_510f4820e1824f9d907a12d56298261a.pdf
    • https://static.usrfiles.com/ugd/dcf9ad_df7336590a0a40eca6eb36f87125e893.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_66f41899fbbc4b36b047ad553abfb01f.pdf
    • https://static.usrfiles.com/ugd/9b5f63_db4d61e6a3634cc887ccdb62eeb2acfe.pdf
    • https://static.usrfiles.com/ugd/5a4c69_f971bbb2dd5d4f1db8c29042d43d6269.pdf
    • https://static.usrfiles.com/ugd/09273f_31810488fc354c9294584d574afc8aa6.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_off00005d04.bin
c389e672df0f9aacf8e4bc09f0a7a0780389fd16f7e3cc03dcb816a5519d3526		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D04 4656 bytes
font_01_sfnt_off00006ce4.bin
915c174607dd680c96253f310d98702c1361346910cc39038b92935a9888386e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE4 10088 bytes
font_02_sfnt_off00008f61.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F61 4324 bytes

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