Malicious PDF — malware analysis report

Static analysis result for SHA-256 25764ff3cd2fb91e…

MALICIOUS

PDF

119.5 KB Created: 2020-08-16 11:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4ab68513de57357cccbdda2d9ebfacd SHA-1: c31513b04a19b37c1d1b8fd29f17a04fc1fd69dd SHA-256: 25764ff3cd2fb91ea4e1098614a5d6310e2e6cd70ca7b610e4e708bc56ed2b4d
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a subtitle download. This indicates a social engineering tactic to lure the user to a potentially harmful site. The ML classifier strongly supports the malicious nature of this PDF. The presence of numerous other links to Shopify-hosted PDFs suggests a link farm or SEO poisoning attempt to increase visibility and traffic to malicious content.

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=legend+of+chusen+2+subtitle+indonesia
    • http://files.aloetteofnwva.com/uploads/1/3/0/7/130739387/guravuzup.pdf
    • http://files.silvercreekcomn.com/uploads/1/3/1/3/131398605/bevowiluzatutaw.pdf
    • http://files.sjuartdesign.com/uploads/1/3/1/6/131606087/wulixakitanajukaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/jewifeberen.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3308/files/bescherelle_franais_conjugaison.pdf
    • https://cdn.shopify.com/s/files/1/0437/4095/4773/files/adventure_time_ice_king.pdf
    • https://cdn.shopify.com/s/files/1/0436/3000/2336/files/66824750584.pdf
    • https://cdn.shopify.com/s/files/1/0438/4843/3829/files/bright_line_eating.pdf
    • https://cdn.shopify.com/s/files/1/0438/5934/5573/files/81816871294.pdf
    • https://cdn.shopify.com/s/files/1/0436/4356/8278/files/76290152547.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46150969179.pdf
    • https://cdn.shopify.com/s/files/1/0431/0663/1846/files/hdfc_bank_demand_draft_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/19948253180.pdf
    • https://cdn.shopify.com/s/files/1/0440/6195/0117/files/tajamalinow.pdf
    • https://cdn.shopify.com/s/files/1/0434/4378/1792/files/davixogodupizurosevawej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1c5.bin
2423fb41c8eced68fc5a9ab43888e203c6bcb63e515c308620c5a5b3a52fbcfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C5 76136 bytes
font_01_sfnt_off0001943b.bin
0ede0a59491b2daf0abd99dd2406d22a3a819b835e1e034348879a6ad6792ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1943B 5400 bytes
font_02_sfnt_off0001a69e.bin
4ce3790ea712a2a1fb18bbae4c9ffb2af4510c0b8d4da04c34e7c0bc284a76b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A69E 13296 bytes

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