Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a344913ffe7d30…

MALICIOUS

PDF

50.1 KB Created: 2020-08-30 16:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f87f7d307be075bc720a5dd205e91280 SHA-1: 3f3b5747224ffc4133dbf7b1a4412004a4f547fb SHA-256: e2a344913ffe7d3041e30703a7d1a1e441b39a4ed63e0f957f36911f875322b2
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are benign but likely serve to obscure the malicious one. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing or malware distribution site.

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=dimensionamento+de+sapatas+exercicio
    • https://static.usr
    • https://static.usrfiles.com/ugd/b8c837_2fd757cb0e90442f996a960c16712c9d.pdf
    • https://static.usrfiles.com/ugd/a771bd_4c60cedb65404fb79da47c6a72693008.pdf
    • https://static.usrfiles.com/ugd/fa6f14_7af221c402304c8fa19d4b660e6dea59.pdf
    • https://static.usrfiles.com/ugd/5a1791_7a0659c1dc794c1e85547eec6dead22e.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/bokupif.pdf
    • https://cdn.shopify.com/s/files/1/0434/5295/6838/files/love_chat_app_free_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0435/5283/3695/files/garufubuwokuseza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupenase.pdf
    • https://static.usrfiles.com/ugd/b8c837_604205606b5744b7bbbff45f4fcc0137.pdf
    • https://static.usrfiles.com/ugd/516793_c250274d52d94bc4af5be2db1e9d20f2.pdf
    • https://static.usrfiles.com/ugd/1f5cef_e5f2f025dda14bf89af4d499729ace6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_12918248429a48a5a194bf0ac226cdbc.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_off00007475.bin
a11f74980ac2e963bf7e99848e3d1a39cd4bf5924efefe2f1297e74489e715b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7475 5256 bytes
font_01_sfnt_off00008636.bin
1d2b134def522423a1cef101e38c35bea6f433ba5e348fa74c953b1a81ef0917
pdf-font-stream PDF embedded font (sfnt) at offset 0x8636 17860 bytes