Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9a1e7b42bd0423…

MALICIOUS

PDF

36.0 KB Created: 2020-08-21 02:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d5f0632f88c4451dde6327cc569378b SHA-1: 045a53c969b047fd427925b78f08617b36f9c8e9 SHA-256: bd9a1e7b42bd04232f4d399e867cc36ca79a5a9624cf4ea8b53f5aaf992fb7fc
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a download for 'Corpse Bride theme song piano sheet music'. This indicates a phishing or social engineering attempt to lead the user to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links further supports a malicious intent, likely for SEO poisoning or traffic redirection.

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.com/pify?keyword=corpse+bride+theme+song+piano+sheet+music
    • http://butotori.embcmanning.org/uploads/1/3/0/8/130873830/todagefelesu-nulasaguxox.pdf
    • http://gopinimof.piperlewine.com/uploads/1/3/2/6/132695675/sexamizo_loferisirekimom_ripegiligijo_pamedap.pdf
    • http://files.magicartsstudio.com/uploads/1/3/0/8/130813888/9491858.pdf
    • http://files.nationalsocietydfpa.com/uploads/1/3/1/4/131453902/fijaxem.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1002/files/73180387888.pdf
    • https://cdn.shopify.com/s/files/1/0435/5751/9523/files/alter_ego_a2_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9512/files/the_secret_law_of_attraction_book_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3767/files/bewibatuzekawinuturomi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1760/8090/files/2491761984.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6463/files/refazugoxikinobotenegat.pdf
    • https://cdn.shopify.com/s/files/1/0436/0326/3650/files/69511717775.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1281/files/tejut.pdf
    • https://cdn.shopify.com/s/files/1/0437/0222/3013/files/medicare_part_d_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/77002513016.pdf
    • https://cdn.shopify.com/s/files/1/0434/0383/7591/files/engineering_statistics_5th_edition_download.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_off00004e61.bin
a4eb7f741a36434c114f5c3d0fa2bc3fafe403619c9979c1914c3c1e22410ecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E61 5500 bytes
font_01_sfnt_off000060de.bin
f2df57fd0f62395727f43a288f2d57e6210881aad45c3466f667ad567f1685c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x60DE 9996 bytes