Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fec30e4cd0d1427…

MALICIOUS

PDF

48.5 KB Created: 2020-08-24 01:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aecfa61c8c24898c7d9f2cf9ee2b4769 SHA-1: 012ba1123a9270c218d11e319aac1d200e46223b SHA-256: 3fec30e4cd0d1427297383dcc9f5dff87e2eaf665b4ce47aa403536c7d273c2a
160 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body also contains this URL, disguised as a tool to 'reduce pdf file size online2pdf'. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm SEO tactic. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may be intended to trick users into believing they need a password for an archive, a common social engineering tactic to bypass gateway security.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=reduce+pdf+file+size+online2pdf
    • http://desil.thegreenmedicineshop.com/uploads/1/3/0/8/130814328/logakip_vares_kegazajezuri.pdf
    • https://cdn.shopify.com/s/files/1/0447/8818/7293/files/bhagavatam_in_telugu_internet_archive.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1829/files/army_apft_scorecard.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/android_mvvm_architecture_components_java.pdf
    • https://cdn.shopify.com/s/files/1/0434/9011/5748/files/65906020855.pdf
    • https://cdn.shopify.com/s/files/1/0433/3993/9994/files/reporter_salary_singapore.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/vsco_x_free_filters_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/2266/4348/files/17631054402.pdf
    • https://cdn.shopify.com/s/files/1/0438/0426/2561/files/76461276314.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/machinery_s_handbook_30.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6486/files/27_amendments.pdf
    • https://cdn.shopify.com/s/files/1/0437/9328/5277/files/papogukerojevugit.pdf
    • https://cdn.shopify.com/s/files/1/0429/1048/2588/files/kovoluvawipun.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_off0000771c.bin
1cd77965235a714d20e3726ef4a0905009abda38fa7b8ee76103ea4316f21c24
pdf-font-stream PDF embedded font (sfnt) at offset 0x771C 5032 bytes
font_01_sfnt_off00008862.bin
453a1200369a97f9c117e55ab3008bd974614aae915bc3b05d6341896083013a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8862 14380 bytes