Malicious PDF — malware analysis report

Static analysis result for SHA-256 425ca7612bbfba42…

MALICIOUS

PDF

38.6 KB Created: 2020-09-06 17:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25685ae30a5e050ec85ea96bc87806cd SHA-1: d5d46febecc5e81a4a92a1e0e16bfd5c66374d51 SHA-256: 425ca7612bbfba425e788f98a7d45d53dd29246ef4b8fd25465e544a4ec152c5
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'sheet music' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness, and the PDF structure itself contained numerous links, many pointing to benign Shopify domains but one critical link to a known malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.me/wix?keyword=libertango+sheet+music+guitar+free
    • https://static.usrfiles.com/ugd/3bcfef_2018df3e602d433c8ba38da01a7ef33a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3cddb0cad2f4dfdb061d0873098eabd.pdf
    • https://static.usrfiles.com/ugd/fd7405_d6d533bae0a94174a4a91cc11328c657.pdf
    • https://cdn.shopify.com/s/files/1/0432/0673/8079/files/wutumejumerozosusopefopi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2207/3506/files/segundo_convenio_de_ginebra.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/blue_eyes_song_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53522836856.pdf
    • https://cdn.shopify.com/s/files/1/0459/6049/5263/files/chicco_bedside_crib_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/addatimes_web_series.pdf
    • https://cdn.shopify.com/s/files/1/0432/8914/9608/files/furul.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/wurivedevinozolimajepene.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5676/files/gexonibagagameweba.pdf
    • https://static.usrfiles.com/ugd/b8c837_22753cedaa424edbbe5fa513a506f6e2.pdf
    • https://static.usrfiles.com/ugd/48f461_9ae222cd71bb4e6f947f66deca46704c.pdf
    • https://static.usrfiles.com/ugd/dc98cc_25b5890d12e84709a7094e96be78943e.pdf
    • https://static.usrfiles.com/ugd/3eed2b_cbeca23fa07d4e5e9e227c6e3fc7e2dd.pdf
    • https://static.usrfiles.com/ugd/271e65_4c56e503ab094492b506a59ecfe5c2b8.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_off000059f6.bin
5e29e30a6bc1ae3b1cfd7d95d87d1ad87ed8c8f465455bf4ddd2c7e43db41339		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59F6 5344 bytes
font_01_sfnt_off00006c01.bin
c3239d5ad66a6425e23510357319871855429f951efdeb316b8b26d0085777d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C01 9764 bytes

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