Malicious PDF — malware analysis report

Static analysis result for SHA-256 b210bc9145cea7f5…

MALICIOUS

PDF

40.1 KB Created: 2020-08-20 18:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14a12065b9bd64fe324250c34ac55bf9 SHA-1: 9fdd30605faf62e4ce5cdde82f40b7daaf1e343a SHA-256: b210bc9145cea7f56c8f163c6fc06c1d22528dee82c4d590c1528f03621acd47
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=apk+facebook+lite+for+nokia+e63`. Additionally, it features a PDF link farm heuristic, with multiple links hosted on `cdn.shopify.com` and one on `sukij.shopcompassrose.com`. The document body, though heavily obfuscated, contains text related to downloading an 'apk facebook lite', suggesting a lure for a malicious download. The presence of a visual download button heuristic further supports this. The primary malicious IOC is the redirector URL.

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.ru/pify?keyword=apk+facebook+lite+for+nokia+e63
    • http://sukij.shopcompassrose.com/uploads/1/3/0/8/130874330/4632394.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mejamuzeditika.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85155057715.pdf
    • https://cdn.shopify.com/s/files/1/0429/9436/8663/files/basotiwutalanuwafegip.pdf
    • https://cdn.shopify.com/s/files/1/0431/3510/7233/files/75081695004.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2512/files/15458643945.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/72841201062.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/beziwakera.pdf
    • https://cdn.shopify.com/s/files/1/0428/2354/9094/files/daxukalibidukidub.pdf
    • https://cdn.shopify.com/s/files/1/0437/8473/2829/files/golenuxexekejotugobir.pdf
    • https://cdn.shopify.com/s/files/1/0431/4470/8245/files/19157273146.pdf
    • https://cdn.shopify.com/s/files/1/0431/4693/6482/files/werinoxanumuwenavinadok.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ca4.bin
33bd69a5de66eb0d26f20d456c04fa9a66e92413f6ec957ddac4f3fc8460114e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA4 5344 bytes
font_01_sfnt_off00006ed8.bin
ffb8df1e8a943d004aab786d4f4c9b998a6a5c78055fa766ff0c4564d6ebc401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED8 11160 bytes

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