Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4360b452266ab7…

MALICIOUS

PDF

56.2 KB Created: 2020-08-30 07:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7f5fa117297124d5db876c52471ec36 SHA-1: 8343a874830dde94ca1420cd3b2a05e30d8e007d SHA-256: ae4360b452266ab7f8c70c68ac339e3941e772dcfc8e91521dafb76eef0741a4
154 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a large number of external links, many pointing to static.usrfiles.com, which is identified as a link farm. The primary malicious URL is https://ttraff.com/wix?keyword=java+1.+6.+0_07. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=java+1.+6.+0_07
    • https://static.usrfiles.com/ugd/5b9365_a442c49236cb42c3a640ae1adc4a0f63.pdf
    • https://static.usrfiles.com/ugd/4dd980_8ae12962348e494fa1409360f9d4d4a1.pdf
    • https://static.usrfiles.com/ugd/b56239_707caa7a5b864d9b96eb773e3f74c8ae.pdf
    • https://static.usrfiles.com/ugd/1decf9_55cec78d71124505a7dd8260f8c76fe5.pdf
    • https://static.usrfiles.com/ugd/b8c837_007c84f8449f45b1aed9b09d4a4f3800.pdf
    • https://static.usrfiles.com/ugd/8b9728_9bb293588fd04d9380119d351008435f.pdf
    • https://static.usrfiles.com/ugd/b8c837_67761bb8f012408c89f3071306faa2bc.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_9132393f3a4b4f38905c8704e3cc07ca.pdf
    • https://static.usrfiles.com/ugd/cec570_458b2b17ce144ab88ec42369b92d2093.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4624/files/grim_dawn_flames_of_ignaffar_build.pdf
    • https://cdn.shopify.com/s/files/1/0432/1532/3291/files/tazikuxekigulojasudukiviz.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006534.bin
7f088ad6b4a3c72b4c55504d514aa5dc7b83de982f6e1ab492cd2ce3ea0bd22e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6534 3972 bytes
font_01_sfnt_off00007354.bin
a086caa21f15a0957e332d655c6d6ad27d2734f571265254ee946d17d654f028		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7354 4236 bytes
font_02_sfnt_off000081b8.bin
a7c7074be71724849a34f78497c28d7d9ecdfcc500c11f401d4d2f5aa8224760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B8 14608 bytes
font_03_sfnt_off0000afc4.bin
1b19f5b9ae2aeff7929e120295d9aee049321614abc14b3ca723126b23f9dd5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC4 16416 bytes
font_04_sfnt_off0000c5b6.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B6 4324 bytes

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