Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdba0dd33964c9d2…

MALICIOUS

PDF

100.4 KB Created: 2020-09-07 07:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36f818c0445e3b008f43725b9389a3ef SHA-1: 40ba48a71e41987933363adb11600451a7177df1 SHA-256: fdba0dd33964c9d23a6603976b8740ed23fa8549b92bbc5f8900e9bb8d2777d3
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a lure to click the embedded link.

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=modern+family+episode+guide+season+1
    • https://static.usrfiles.com/ugd/a107db_14f9af0f5f4a47098eb397c6fd6dc42b.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_67f632fdf191463da2d81e0b00b7e212.pdf
    • https://static.usrfiles.com/ugd/46a5ae_3678915696234078ac6a0b9dc2f03bd1.pdf
    • https://static.usrfiles.com/ugd/e1c37d_a9897287ab92484a8556a0aef82b9c28.pdf
    • https://cdn.shopify.com/s/files/1/0435/7816/3363/files/search_text_windows_explorer.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7904/files/sexekobiwatedek.pdf
    • https://cdn.shopify.com/s/files/1/0439/7580/3038/files/48236645237.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/eager_beaver_chain_saw_manual.pdf
    • https://static.usrfiles.com/ugd/c63bf9_6de6c3476d924e0b95e1da04cc8d9349.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a099aa030a84d0eb09d07f9fefb500f.pdf
    • https://static.usrfiles.com/ugd/9eb187_b0fb0a46aa8b49a3bc7fdc2b6d6dcb44.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b38c6e2aa7846ceaa1715db355501a9.pdf
    • https://static.usrfiles.com/ugd/c20ea7_ba19c1222c6443cdbf9197616fe14240.pdf
    • https://static.usrfiles.com/ugd/1b7c00_a18017f6f173493090bb99964be263b1.pdf
    • https://static.usrfiles.com/ugd/ab922d_fd2bddb95fcb473ba9bcf353e39cb762.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_off00012df2.bin
b596f853bac2aa9b1e2c3febe9dda177822d5246bd13bc37aff3dbf6a4f4d87a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF2 5320 bytes
font_01_sfnt_off00014000.bin
963ab4292491eae29e87389c88b75c68a1fd2a5703c0fcfac8de9b0f08aac6e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14000 16744 bytes
font_02_sfnt_off000173e7.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x173E7 4324 bytes