Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbdf372b7d8d737…

MALICIOUS

PDF

44.6 KB Created: 2020-09-01 02:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 672643eaa5d430c824adfadc47c4fdc6 SHA-1: 3267a64d437a638616f650dddd49fbe4caf5f262 SHA-256: cdbdf372b7d8d7377d3623975fde066fe7d9bab173b5a47fe6b2a4cdc107b84b
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically identified as a malicious redirector pointing to 'ttraff.com'. This indicates an attempt to lure the user to a potentially harmful website. The document body contains garbled text but also includes the URL 'https://ttraff.com/wix?keyword=ringtones+for+android+latest', reinforcing the malicious redirector finding. The presence of a large number of external PDF links, many hosted on 'static.usrfiles.com', suggests a link farm or SEO poisoning tactic to distribute the malicious content.

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=ringtones+for+android+latest
    • https://static.usrfiles.com/ugd/cfbfd2_6cfc765151bf42d7bce8f5ae4b92baa2.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2a1fcf02e7b413fa64c9be161872fc0.pdf
    • https://static.usrfiles.com/ugd/88a84f_a4ec35a865734276a9871da0491859bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fd49c83dee04e82a9ad8695ef5cdc45.pdf
    • https://static.usrfiles.com/ugd/b8c837_89a4ea3ff8a14ee09f582ce94b139d16.pdf
    • https://static.usrfiles.com/ugd/36f25b_f54510c0fda14502b9ea86a1f86667f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_efd06bd06baf434aa44f185218b28860.pdf
    • https://static.usrfiles.com/ugd/2b3f46_4112c4175f83428d916f34b6ea7ae3e9.pdf
    • https://static.usrfiles.com/ugd/de60da_cd4980cb09394944900247851cfb5da7.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6333/files/usarec_form_1037.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/wimuzewegor.pdf
    • https://cdn.shopify.com/s/files/1/0437/3794/0122/files/spoken_english_book_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0450/6199/6694/files/jikoluzosif.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_off000064a4.bin
22cb84006f44b0d500a4da268f03a94641cdcbdad56964c1ab36af6ad15a0cd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A4 4868 bytes
font_01_sfnt_off0000753c.bin
5ba4be366daceda59e6222563d5bbe02945659369db9ab0433574112029b6750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753C 10120 bytes
font_02_sfnt_off000097e0.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E0 4324 bytes

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