Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c53509ae5c6d15…

MALICIOUS

PDF

54.6 KB Created: 2020-08-30 15:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f373502974ede52fe548b594490521a1 SHA-1: 1aa6cd1d9e07b8d2bda7cceb92dff5287af36dd2 SHA-256: 85c53509ae5c6d15df5d023381cf42e4867ea3dfc849001ac674eef2d5728816
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to benign Shopify URLs, but one critical link to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking search query. This suggests the PDF is designed to lure users into clicking the malicious link, likely leading to a phishing page or malware download.

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/wix?keyword=elphaba+quotes+wicked+book
    • https://static.usrfiles.com/ugd/04e6f9_f0c445c666374429b6af9a8e7dbe7e72.pdf
    • https://static.usrfiles.com/ugd/affaa6_657e6cefa26645f2822ee42657072722.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c45879901e34e7a9171cf37e6f36f16.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/58364160819.pdf
    • https://cdn.shopify.com/s/files/1/0435/3851/4071/files/take_6_songs.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kazapuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/36452076221.pdf
    • https://cdn.shopify.com/s/files/1/0433/4243/0362/files/22099037165.pdf
    • https://cdn.shopify.com/s/files/1/0430/0737/7567/files/cdte_solar_cell.pdf
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/regedazutegewigiwinizapux.pdf
    • https://static.usrfiles.com/ugd/72b0e7_0b40899c14c4463e8280f430c364cf5d.pdf
    • https://static.usrfiles.com/ugd/0e2875_5cf0f4bc13354b978e4e2c06ce004695.pdf
    • https://static.usrfiles.com/ugd/8b9728_bf37fd35ee6948869be4c224ba343943.pdf
    • https://static.usrfiles.com/ugd/c0fca2_517d526776534e2982a2b87b3000ea7d.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_off0000825e.bin
882a8f263a8114f4858465bc3e9eb09349114a6cbbede4168c0e7b9003bef44b
pdf-font-stream PDF embedded font (sfnt) at offset 0x825E 5444 bytes
font_01_sfnt_off000094e4.bin
6826c98366934d0d7d50980b56214dde94a2ceaf2bb0e9e1b3c98af0ec87cfad
pdf-font-stream PDF embedded font (sfnt) at offset 0x94E4 10120 bytes
font_02_sfnt_off0000b7c7.bin
743ca15f7e80ab48f95ef14f9c0bf512a5f853e906dbd76a987f8d42d824727b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C7 16184 bytes