Malicious PDF — malware analysis report

Static analysis result for SHA-256 5600c253c9bfa860…

MALICIOUS

PDF

38.0 KB Created: 2020-08-24 19:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd746a063eb6f4230c2801b8fd97a36d SHA-1: 63a5eb4fa40d543854f339374872b9bd7f9d5a58 SHA-256: 5600c253c9bfa8601ab5462e598d7e4fae34b64c1cc4db9d4cb2ae7841f2f0a0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with multiple links pointing to Shopify domains and one critical link to a known malicious redirector at ttraff.cc. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=asking+directions+worksheet+pdf, indicating a lure to a malicious site. No scripts were extracted, but the presence of the redirector and link farm suggests a phishing or malware delivery attempt.

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=asking+directions+worksheet+pdf
    • http://files.nicolechinuntdet.com/uploads/1/3/0/7/130775825/xosekeludo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3876/files/alter_ego_plus_3_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/panumuniwo.pdf
    • https://cdn.shopify.com/s/files/1/0436/7027/4201/files/pagegalipefudabelunikomim.pdf
    • https://cdn.shopify.com/s/files/1/0434/6209/9097/files/rotikud.pdf
    • https://cdn.shopify.com/s/files/1/0432/6565/4939/files/aquage_transforming_paste_pump.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7961/files/convert_byte_stream_to_c.pdf
    • https://cdn.shopify.com/s/files/1/0435/4847/5541/files/sanskrit_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3740/8936/files/tazasabumevukuzijinunabus.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/xibiriretukiwunofamuna.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_off00005739.bin
6197147d5b28b05fc42be5c9ae6eefd2b735deedb1219964ffca994fe2adedef
pdf-font-stream PDF embedded font (sfnt) at offset 0x5739 5320 bytes
font_01_sfnt_off0000695f.bin
616d12e6445b3b97b8c25f3e4df26081e11c469b8c24429b532246fa6c2dbda2
pdf-font-stream PDF embedded font (sfnt) at offset 0x695F 9980 bytes