Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f62fdef77e0442b…

MALICIOUS

PDF

45.7 KB Created: 2020-08-30 08:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f50c6a35f6788c72250f6be00cf0e154 SHA-1: a9efe432545229c502a34bbd6071fc49d503fd4f SHA-256: 5f62fdef77e0442b3fb88c288af0525ee345b291c0109c52ec35f5a5c8145846
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or phishing attempt. Although no scripts were extracted, the PDF structure itself facilitates redirection to malicious sites.

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=louise+ogborn+video
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9421c8_12fc29e5268941ecb7364bc1487fd040.pdf
    • https://static.usrfiles.com/ugd/b8c837_8dc00927f9bc495dbb3696621fa70c90.pdf
    • https://static.usrfiles.com/ugd/b8c837_211b446656c542b4a8ac6ae80963af28.pdf
    • https://static.usrfiles.com/ugd/b8c837_766d50c1f1614583b851d51ddf05118f.pdf
    • https://cdn.shopify.com/s/files/1/0429/7093/9541/files/canaux_ioniques.pdf
    • https://cdn.shopify.com/s/files/1/0464/7701/7238/files/pinupalebevos.pdf
    • https://cdn.shopify.com/s/files/1/0462/3650/0128/files/61025463996.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lipowu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/47743556776.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce6eef643ae1473992e4e40a475ccbc1.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_b1e6b9fbf09c49da9316f58384c5ac3d.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/36314293010.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/84031040502.pdf
    • https://cdn.shopify.com/s/files/1/0432/2033/6807/files/3d_cape_editor_for_minecraft_pe_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5592/files/astronomy_today_volume_1_the_solar_system.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007686.bin
dcb552f62c8a07f9a8dd217b8a667043bc515ad68a3cee0d773ae4dba9206cf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7686 4892 bytes
font_01_sfnt_off00008743.bin
f062d6e4701f85365c573d117f788bf4a3e2d8da00c948e6a738a2e878069617
pdf-font-stream PDF embedded font (sfnt) at offset 0x8743 10272 bytes