Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cdb86e97db0595…

MALICIOUS

PDF

41.7 KB Created: 2020-09-01 11:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ffa9df78b6d15fd9fb6eba46c9b3ed6 SHA-1: ffc5c5e1b48e372b4110aa14496fd08ef123387a SHA-256: 82cdb86e97db05954fdfddff650d061fee02d813cc88549d75fed064ad62f4c4
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body text, though partially corrupted, includes the phrase "Clinical pharmacy review pdf" and a URL that appears to be part of a link farm designed to generate traffic. The presence of numerous external PDF links, many pointing to Shopify, suggests an attempt to create a large number of SEO-optimized landing pages, with the primary malicious link being the most concerning IOC.

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=clinical+pharmacy+review+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tedix.pdf
    • https://cdn.shopify.com/s/files/1/0434/0957/1990/files/gejofu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4519/0821/files/divaxudagutofuviw.pdf
    • https://static.usrfiles.com/ugd/078c79_242d2d6cc8a84c94b39d3b2a574c1234.pdf
    • https://static.usrfiles.com/ugd/c1108c_f93c5be4618a4b9f8b659fc5978d46f9.pdf
    • https://static.usrfiles.com/ugd/314c35_bea9af5d70ee429c95ca10f46f795ae2.pdf
    • https://static.usrfiles.com/ugd/3f80ec_ddb7510d3bfb46ecadf120524f8833f5.pdf
    • https://static.usrfiles.com/ugd/38eac1_ffb350f451e441798ac00892a1b50e50.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec3d689228164c1db9f51abafd93d476.pdf
    • https://static.usrfiles.com/ugd/b5472a_10e57df46fd84bcc8d50785e3212a42b.pdf
    • https://static.usrfiles.com/ugd/0adedf_7bc9d758d22344ee971bfc7cee41cdf1.pdf
    • https://static.usrfiles.com/ugd/d54300_2e3644d96b64453c90c333f2ae483969.pdf
    • https://static.usrfiles.com/ugd/9dda13_fd7b02cecb10479c8e4941bd711c021e.pdf
    • https://static.usrfiles.com/ugd/451461_6132f5983dbe4811a446c3aa7b8503e3.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_off000063ae.bin
5b2339b900d6e12528de82a9f47f6b1a3098a64225fd9264a20a848fa31db502
pdf-font-stream PDF embedded font (sfnt) at offset 0x63AE 5376 bytes
font_01_sfnt_off000075e9.bin
e357f10f983e35930cb83c615c23ac0c0ca5f307e161f12e63eda701bce13edd
pdf-font-stream PDF embedded font (sfnt) at offset 0x75E9 10512 bytes