Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ddba1a4e16aed2…

MALICIOUS

PDF

40.9 KB Created: 2020-08-29 02:39:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f11f128796d46ccff2773faade05c8 SHA-1: 8963721e16bbf35e80900320c3916d9003ed7962 SHA-256: b9ddba1a4e16aed2d42284ee9aa2cebab508bcbf83a37d692705d26b3a05abd6
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. This suggests the PDF is designed to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted from this sample.

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.link/wix?keyword=ap+stylebook+2017+ebook
    • https://static.usrfiles.com/ugd/b8c837_5714bae28ead4cc998467ce501fe75ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_66510327cdb34ea39dd840bf1933f4ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_b808b95149b2475b9d7c95cc09e6ec70.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e6c33583d0149a1b0a00f7e04f99994.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbde0697eade453e89748eba8e4cc329.pdf
    • https://static.usrfiles.com/ugd/b8c837_d38277e2a9b847398950cba23cbe59a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0bbb218a3344a518b3ca18c344ff1bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb266ad399ab432cb24afee902bc21d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_feeda288822742148fcb0f58dd7efac9.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2818/files/95862637613.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6741/files/39659817470.pdf
    • https://cdn.shopify.com/s/files/1/0457/9970/2694/files/zumukaturinegedudojota.pdf
    • https://cdn.shopify.com/s/files/1/0453/9786/8712/files/blender_animation_course.pdf
    • https://cdn.shopify.com/s/files/1/0433/4954/1013/files/comparative_and_superlative_adjectives_worksheets_printable.pdf
    • https://cdn.shopify.com/s/files/1/0437/6831/6055/files/62177885734.pdf
    • https://cdn.shopify.com/s/files/1/0436/3350/8512/files/rusefopolimat.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_off0000615f.bin
637c412f66a6e9f945f8ea6b760cc5fbed50b269a76a987437d1ef58a7e9dd88
pdf-font-stream PDF embedded font (sfnt) at offset 0x615F 5208 bytes
font_01_sfnt_off00007348.bin
61c9a021baf036843e721f8cb3a26be5e79da5c1e6b11db69bf3c4fc331735f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7348 10476 bytes