Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5378ec90792450…

MALICIOUS

PDF

41.8 KB Created: 2020-09-06 17:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cad1346b790b0fae0b8f49f598a3b56 SHA-1: 8421d242eb07fec97e3103f59a012b34c4bfc5cd SHA-256: ca5378ec90792450e77b8684a43a6b625fce9682d3c37489e68c60bf430bbc10
120 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, a common tactic for SEO poisoning or link farms. One critical heuristic identified a link to a known malicious redirector, 'ttraff.link', which is presented within the document body as a link to 'alto saxophone music sheets free printable'. This suggests the document is designed to trick users into clicking the link, leading them to malicious infrastructure. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Heuristics 3

  • 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.
  • 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.link/pify?keyword=alto+saxophone+music+sheets+free+printable
    • https://cdn.shopify.com/s/files/1/0431/8386/6007/files/dapakefusupaxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1047/files/tinabifaxafedo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/fotuzorik.pdf
    • https://cdn.shopify.com/s/files/1/0437/8011/2545/files/address_to_send_completed_attendance_allowance_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/9557/3158/files/best_free_website_er_for_mac.pdf
    • https://static.usrfiles.com/ugd/bcfc12_8601ec29242c485a89d5efbc178b6c4d.pdf
    • https://static.usrfiles.com/ugd/4cf28d_2f619475b7a24a09b5616c748d72c2db.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/vogokarafutob.pdf
    • https://cdn.shopify.com/s/files/1/0429/4171/0499/files/ballade_pour_adeline_easy_version.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9215/files/rudikezakoxipe.pdf
    • https://cdn.shopify.com/s/files/1/0438/5354/5632/files/daxed.pdf
    • https://cdn.shopify.com/s/files/1/0434/5013/8784/files/98154644150.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_1b6578aaf25b4c56a40b70addb0db56c.pdf
    • https://static.usrfiles.com/ugd/5b604d_0b2e530ee2564937b8dc4a7da29a99c9.pdf
    • https://static.usrfiles.com/ugd/1decf9_824f561e1ded4e868601452f5dddb516.pdf
    • https://static.usrfiles.com/ugd/5ad03d_d2b7ec098bfc4c55821829404d726635.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_off00005946.bin
0f49b509890a87f9e52fa9d6001e966c1433c0b942b12284db71551be3cd59cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5946 5452 bytes
font_01_sfnt_off00006bab.bin
0504af1cb7ce1f8b54f2ab9184c9ed34fc81c2a5a1302463beeab8e1330b6096
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAB 14740 bytes