Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f7aaf765e4b07d…

MALICIOUS

PDF

41.4 KB Created: 2020-08-29 22:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a165e7f368279553f34583face7579d3 SHA-1: e2865bedcde1ccd2d0c930e7d475ebb2e8e4aed1 SHA-256: f8f7aaf765e4b07d40a63bbd3ee0b2793f0f3edabcf87b15e27088fb2d162b4d
150 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One prominent URL, 'https://ttraff.com/wix?keyword=msi+z87+g41', is flagged as a malicious redirector. The presence of many external links, including to 'static.usrfiles.com', suggests an attempt to lure users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=msi+z87+g41
    • https://static.usrfiles.com/ugd/b8c837_7366e8f288254cdc89682d91f35a805a.pdf
    • https://static.usrfiles.com/ugd/5bb01c_fc62776ff530463383319a460c251828.pdf
    • https://static.usrfiles.com/ugd/b8c837_45cafff96f0c4c6e860a84dd12a82834.pdf
    • https://static.usrfiles.com/ugd/b8c837_08b91a96f3c442e09092f9c64505cbca.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c386b6eac7244b1864d68e86a4d93ad.pdf
    • https://cdn.shopify.com/s/files/1/0447/6076/0471/files/professional_apology_email_template.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/blackberry_white_formal_shirt.pdf
    • https://static.usrfiles.com/ugd/63d3ad_5e4371dd726d497b8579d2004a062314.pdf
    • https://static.usrfiles.com/ugd/b8c837_891e1e417a1c4325ab2beba557355967.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3faba924c5144b0899bbc2da6b149b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_0456f83b53964426a41325bac41d8f95.pdf
    • https://cdn.shopify.com/s/files/1/0433/0435/3950/files/fiwogixigokugo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1764/9819/files/the_cask_of_amontillado_annotations.pdf
    • https://cdn.shopify.com/s/files/1/0434/5682/3453/files/google_arts_and_culture_face_match_android.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/37806942368.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8769/files/gimopupimeduxinurakukif.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_off00006442.bin
ba74108b2ec5eae7b6c75ca618c3bc02c68b78143da45eefaa9412a8d45b69dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6442 4984 bytes
font_01_sfnt_off0000756c.bin
17076bf35840cbbbc75e43e326aa929e914052bcc4c624e4c127dc7eb78c8c26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756C 10396 bytes

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