Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d8685e20130a76…

MALICIOUS

PDF

48.8 KB Created: 2020-08-29 15:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f661335a43fbb0e77ecfbbe2cd1cde6e SHA-1: aa8a69e467375b77451d468840c6ae0deb8db737 SHA-256: 59d8685e20130a7671e49e3cf49f9c7f60ebd3f0e79b027e75482cc90f872ae4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. This indicates an attempt to redirect the user to a malicious site, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains the same URL, reinforcing its malicious intent. The presence of numerous other PDF links, while many are marked as benign, suggests a link farm strategy to obscure the primary malicious destination.

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.cc/wix?keyword=legal+environment+of+business+9th+edition+pdf
    • https://static.usrfiles.com/ugd/b8c837_7c0f24aff7b047609dab73deaffd0e8b.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_a065d1323f7e45bdbb0f4ff21b5e7eb2.pdf
    • https://static.usrfiles.com/ugd/b8c837_98f4388ee5e94d30af131694b62b071d.pdf
    • https://static.usrfiles.com/ugd/b8c837_24d4cd058f51436da210f6450c6aeeb7.pdf
    • https://static.usrfiles.com/ugd/b8c837_9204ea580f5f44c6bc5d9c83bcc08aba.pdf
    • https://static.usrfiles.com/ugd/b8c837_2be55c7e8b444c1fa019757a913632e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_29cc4f099a0f4d629efbc9cdbdbc87e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d7761434a5449a08151a7cdeeb9cc05.pdf
    • https://static.usrfiles.com/ugd/b8c837_90e543a84ac842c8b8da92c186c818f7.pdf
    • https://cdn.shopify.com/s/files/1/0434/6245/9544/files/javascript_file_formatter_online.pdf
    • https://cdn.shopify.com/s/files/1/0435/5463/5937/files/78871530832.pdf
    • https://cdn.shopify.com/s/files/1/0435/3366/4420/files/dowry_prohibition_act_1961_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/i_belong_to_you_lyrics_muse.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_off00007007.bin
8b76cd1b8d32b61768a25b421863024796350f2ffb0b2f32698a1b3d583b05fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x7007 5636 bytes
font_01_sfnt_off00008309.bin
58879c3b4a219c2355e7a94593a9f77c064d879a164a6bbe0cdc6a709a4a11bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8309 11024 bytes
font_02_sfnt_off0000a815.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xA815 4324 bytes