Malicious PDF — malware analysis report

Static analysis result for SHA-256 24aa4c0f7fe0bc50…

MALICIOUS

PDF

34.6 KB Created: 2020-08-31 10:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f30f9b7f1506a99402e10691ed0b50c1 SHA-1: 6b9fb48afba815a3cc29cc0cda9e199f883ea32f SHA-256: 24aa4c0f7fe0bc50bc586763910c6778635086bf3c1a13d8187e01572252250f
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 a URL that appears to be part of a link farm designed for SEO manipulation. The document body, though heavily obfuscated, contains the text 'Star wars the last jedi visual dictionary free download' and the malicious URL, indicating a lure for users seeking free content. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which likely leads to further malicious content.

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=star+wars+the+last+jedi+visual+dictionary+free+download
    • https://static.usrfiles.com/ugd/71fd01_2152e150bde94ad396e071c45c33c07d.pdf
    • https://static.usrfiles.com/ugd/30e015_a11e39604e5441138fc9404b9626d7df.pdf
    • https://static.usrfiles.com/ugd/b8c837_a322527bd40c4432be99b75aae917238.pdf
    • https://static.usrfiles.com/ugd/45e30f_494c6362a33e40c8983ed36365bbaaea.pdf
    • https://static.usrfiles.com/ugd/b8c837_f23c293ec4514393949cf6601bb91e84.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rosetotirumeza.pdf
    • https://cdn.shopify.com/s/files/1/0440/1584/5541/files/jilofilisejozobezoj.pdf
    • https://cdn.shopify.com/s/files/1/0427/8019/7031/files/92959562536.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/run_report_as_logged_in_user_salesforce.pdf
    • https://cdn.shopify.com/s/files/1/0437/8044/0213/files/autocad_2020_manual_cz.pdf
    • https://cdn.shopify.com/s/files/1/0440/2331/6630/files/vinugogedetaxulaviro.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/28665765729.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_off000047f1.bin
80ab13d6c5b4daa75b21338a16a42a9e8b830ff6a9f403277861990ab2161047
pdf-font-stream PDF embedded font (sfnt) at offset 0x47F1 5544 bytes
font_01_sfnt_off00005ada.bin
47036896a90f2e76a2d4ad0d5b95e0b5624c363f02890b30faf9a27386ebfbef
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADA 9992 bytes