Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f02b4e3def4f42…

MALICIOUS

PDF

49.9 KB Created: 2020-09-01 05:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9ee04092d5e2fa27ced2eeaad3aeef9 SHA-1: e87457a80f8d36aa251d4ed07f33de49f15e7d20 SHA-256: 27f02b4e3def4f4274f67384529c233125458d1e7937c8600b4ce8eb650b5d6f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link, specifically 'https://ttraff.ru/wix?keyword=c+template+internal+linkage', which is designed to lure users to malicious infrastructure. The document also exhibits characteristics of a link farm, with numerous embedded links to other PDFs hosted on various domains. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence for a high confidence assessment.

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.ru/wix?keyword=c+template+internal+linkage
    • https://cdn.shopify.com/s/files/1/0432/7954/8580/files/cartilla_fonetica_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5885/files/90840899715.pdf
    • https://cdn.shopify.com/s/files/1/0432/7935/1968/files/apothecary_cabinet_plans.pdf
    • https://static.usrfiles.com/ugd/77941b_d98b50437a614da1ac6f4754c7fa21d2.pdf
    • https://static.usrfiles.com/ugd/b972d5_c42f89d38b18443587869bbccc9cbc41.pdf
    • https://static.usrfiles.com/ugd/909b15_3421b2cdf1ed47efb47e8a63be5586cc.pdf
    • https://static.usrfiles.com/ugd/f55bec_989ca4cca06641dc9f4cae53a6272cb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_5eb25f9902e447c89147184e0b68948f.pdf
    • https://static.usrfiles.com/ugd/36f25b_195641fe63814583a56f32037ff30c21.pdf
    • https://static.usrfiles.com/ugd/6f58fb_b604063fc22a43cf838c865e50159191.pdf
    • https://static.usrfiles.com/ugd/b8c837_d60a253521604a70a085a6ae6c6c100c.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_4afc687c081d4a82823d308b9a8d2bbd.pdf
    • https://static.usrfiles.com/ugd/f8de3e_b6f789a753e0476ea60cc98c01a1dd07.pdf
    • https://static.usrfiles.com/ugd/e78b77_f322e085c3c443478b0ddd9c2cac8503.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_off00007b64.bin
c7354c18bed10dc2dda59d6d32d600bfcdd1d8e3ad7b1237cad4b70cdc142598		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B64 4932 bytes
font_01_sfnt_off00008c10.bin
fa9d1b14a035f7a24d380dbeca25ddf232b71e81f8d59cd8c355c186ad9c98cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C10 14740 bytes

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