Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6fe323af56a841…

MALICIOUS

PDF

45.9 KB Created: 2020-08-24 13:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d93c3d427d750f2c29701b823d388035 SHA-1: 6091854631d31fb5c439478e6512cb55f70b12b6 SHA-256: 7c6fe323af56a841610b7938aba0a8b0dbbcff80fc717719f63ceeca7fdda039
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, https://ttraff.cc/pify?keyword=bruce+lee+songs+free, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=bruce+lee+songs+free
    • http://files.project-cosmetics.com/uploads/1/3/1/4/131483343/95fbd82ffc86c3.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/what_is_the_iphone_model_a.pdf
    • https://cdn.shopify.com/s/files/1/0460/7672/3364/files/black_and_white_strappy_platform_sandals.pdf
    • https://cdn.shopify.com/s/files/1/0434/5954/3192/files/tirakesewodixizo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2230/9786/files/49574323357.pdf
    • https://cdn.shopify.com/s/files/1/0437/5710/9399/files/spring_framework_documentation_5.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/dagufusubuzumudi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9759/files/kepatupugerifexapolid.pdf
    • https://cdn.shopify.com/s/files/1/0427/9386/1279/files/78363495017.pdf
    • https://cdn.shopify.com/s/files/1/0430/9221/3911/files/bixupojonuzoteki.pdf
    • https://cdn.shopify.com/s/files/1/0431/1914/9216/files/2019_elantra_sport_manual_review.pdf
    • https://cdn.shopify.com/s/files/1/0448/3104/7842/files/pneumatic_rod_bending_machine.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_off00007723.bin
c4a53a203f1f660cb82179eddd1d1f8be49575d568548be5f97f61c3ff2aab53
pdf-font-stream PDF embedded font (sfnt) at offset 0x7723 4888 bytes
font_01_sfnt_off000087dc.bin
0a6c10dcac387a1a0b520ebc3cb70d91b90cf3173a1813bb580ec8a99ff6e83e
pdf-font-stream PDF embedded font (sfnt) at offset 0x87DC 10464 bytes