Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf80b96eb0fdc79…

MALICIOUS

PDF

53.1 KB Created: 2020-09-07 16:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df2b44c89d41aaa7800cd4b772c58d26 SHA-1: ba11e5e2468c5f983fe712ec4cd8ae9295f7cffb SHA-256: edf80b96eb0fdc7915a8cb2f74db7a7e3d94cd86bcd89422b1138de356e2b744
152 Risk Score

Malware Insights

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

This PDF file was identified as malicious due to the presence of numerous embedded links, a technique often used to create link farms. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure at 'https://ttraff.me/wix?keyword=c+form+format+maharashtra'. The document body contains garbled text but includes the same suspicious URL, suggesting an attempt to lure users to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=c+form+format+maharashtra
    • https://static.usrfiles.com/ugd/b8c837_6eb4a8b1930d423eb87b3e8f3afcc765.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_c5c87c9e57014c0da27761ea517158a1.pdf
    • https://static.usrfiles.com/ugd/b4f0c6_d2ae8639b36a443099cff1180355bd75.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/tadajezu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8412/files/amma_sentiment_songs_in_tamil_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_6212f1430b58437d84a577fc1e1c08ef.pdf
    • https://static.usrfiles.com/ugd/9904c2_df0d6f1b5ad445fe99fb73742f849e93.pdf
    • https://cdn.shopify.com/s/files/1/0459/7727/2487/files/android_studio_extends_appcompatactivity_and_fragment.pdf
    • https://cdn.shopify.com/s/files/1/0448/7023/8370/files/educational_administration_and_management_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/xisefilowezujafudezibap.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/wifomunifi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/giulio_carlo_argan_arte_moderna.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_off00009475.bin
c3d8b5065de170b02fee5e28f7dc7cda224297f142ec1dcf9137077cf2952ebf
pdf-font-stream PDF embedded font (sfnt) at offset 0x9475 4880 bytes
font_01_sfnt_off0000a4d8.bin
d218a76c056dbde9a5ab299b73c74841777eaab9da9714901ad4be7f7e86bda6
pdf-font-stream PDF embedded font (sfnt) at offset 0xA4D8 10172 bytes