Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e66cf6dcea72bc3…

MALICIOUS

PDF

38.0 KB Created: 2020-08-19 10:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9bf95d3b1b2c4bb38224b045b2dcfce SHA-1: 9a0200a5f91f629149fa08eec09c2bdf96aea0e7 SHA-256: 7e66cf6dcea72bc3cae58a7071006c43f386b16db85e1727f7728dede9f479bb
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains text that appears to be a lure for sheet music, and the PDF itself contains a large number of links to external PDFs, many hosted on Shopify. The primary malicious link is https://ttraff.com/pify?keyword=gimme+some+lovin+piano+sheet+music, which is designed to redirect the user to malicious infrastructure.

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.com/pify?keyword=gimme+some+lovin+piano+sheet+music
    • http://files.mudgeebusiness.com/uploads/1/3/0/7/130775714/c89a1eda8a6a24.pdf
    • http://files.anhhongsaigon.com/uploads/1/3/1/4/131453907/jipafowotepuvir.pdf
    • https://cdn.shopify.com/s/files/1/0434/2621/8134/files/opposite_of_misogamist.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/vukixozepegepunopu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5989/5717/files/zukukipebezolurud.pdf
    • https://cdn.shopify.com/s/files/1/0437/1241/3851/files/69_vw_bug.pdf
    • https://cdn.shopify.com/s/files/1/0445/9751/0308/files/logical_reasoning_questions_and_answers_for_cat.pdf
    • https://cdn.shopify.com/s/files/1/0437/5976/3617/files/kulovobizod.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/33277729764.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/goxuboku.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/mebuziteg.pdf
    • https://cdn.shopify.com/s/files/1/0437/7654/0834/files/aarti_kunj_bihari_ki_song_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/probability_theory_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0435/5430/8245/files/pengertian_bronkopneumonia.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_off00005586.bin
93fd1f84642ab74b9a1b8f5025d35156cda0df87c5505428a6bea245aab2e4d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5586 5168 bytes
font_01_sfnt_off000066fd.bin
50b9a70178c6d7a0073136f691959f576e0551e38413eda683baa7de1505a450
pdf-font-stream PDF embedded font (sfnt) at offset 0x66FD 10816 bytes