Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6401410b3b56b4…

MALICIOUS

PDF

56.0 KB Created: 2020-08-30 17:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23eaff47a4e26bab920014eff41c9271 SHA-1: 7fafa4ab2459d6ad270b1b361bfc3c4d6514a516 SHA-256: 1f6401410b3b56b47d0e3292cd1d01404cbc0bc0d8f30b37acbb80892f05aeb8
154 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious. It contains a link farm with numerous embedded URLs, including a known malicious redirector at 'https://ttraff.link/wix?keyword=ejercicios+resueltos+de+cinematica+1'. The document body is heavily obfuscated but appears to contain metadata related to the PDF's creation. The primary attack pattern involves luring users to click on these links, which likely lead to phishing pages or malware downloads.

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.link/wix?keyword=ejercicios+resueltos+de+cinematica+1
    • https://static.usrfiles.com/ugd/3b7182_65a79d170dc24462abe8d03a5f630c1a.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_00399653dab94e16a9d2d76a63908061.pdf
    • https://static.usrfiles.com/ugd/8b2c09_68d27396fdf747e18e4c959fb5b8e451.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/keribidewijitarijosikab.pdf
    • https://cdn.shopify.com/s/files/1/0462/5619/3687/files/magagabulatewodup.pdf
    • https://cdn.shopify.com/s/files/1/0429/5737/3589/files/media_player_source_code_in_android_studio.pdf
    • https://static.usrfiles.com/ugd/b8c837_1351572647e1432a8131b2b08e7c330b.pdf
    • https://static.usrfiles.com/ugd/078c79_c7c07cb816594cb39982028f553a9a7a.pdf
    • https://static.usrfiles.com/ugd/06497e_4b489dba24ce4c338eade29f090d4951.pdf
    • https://static.usrfiles.com/ugd/9904c2_463ed88a0d114b34965d7f958ba36971.pdf
    • https://static.usrfiles.com/ugd/fd3290_ca5642c0d62e4c5089d61e87c540b8b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_20a9538995984268b82dbb607e47bee9.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_off00007c0b.bin
303330b1a1e6e30700b027f01b33dff885f863c42ccb42a135cea4633a5aa271
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0B 5168 bytes
font_01_sfnt_off00008d87.bin
2f42eb3115bb2451207fd22b166b0c070ac67579357d01539711552cd244d86f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D87 14612 bytes
font_02_sfnt_off0000ba5f.bin
bb08d463bbca5953a0edea2a8b3f54e7d5c7cad84e44829cd73428e3c98cd6a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5F 16628 bytes