Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b46319696c732c1…

MALICIOUS

PDF

38.1 KB Created: 2020-09-01 16:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36a59900f03911686bbd626350090d84 SHA-1: bd129ebe6f0746e64f7a91c158c30f48f15e8391 SHA-256: 1b46319696c732c17f662969379ec266bc2e6d4720fe35e14d4059800eb9cd00
152 Risk Score

Malware Insights

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

The PDF contains a link farm of 24 external PDF links, with the primary link directing to a known malicious redirector. The document body contains garbled text but includes the target URL and a related benign URL. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to malicious infrastructure.

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=el+camino+del+artista+pdf+descargar
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/45965065757.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/chemistry_formulas_in_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/0003/5485/files/bipovupipefote.pdf
    • https://static.usrfiles.com/ugd/1fa6dd_947c6789526b424ebff7d071a5267940.pdf
    • https://static.usrfiles.com/ugd/590778_6492f157dd354644ba5ab5a91259826c.pdf
    • https://static.usrfiles.com/ugd/2b25e8_98e096e828fc48a0b8a62ec78d1ba791.pdf
    • https://static.usrfiles.com/ugd/fb5067_ecab117b4baf41a6898735ab89d1f37e.pdf
    • https://static.usrfiles.com/ugd/4d400c_bf35a46b5e3041d9825caaacd4a1bf79.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/68158117910.pdf
    • https://cdn.shopify.com/s/files/1/0432/6968/5414/files/lidl_galati_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0436/5955/9065/files/58725402315.pdf
    • https://cdn.shopify.com/s/files/1/0433/7090/5756/files/principles_of_how_to_win_friends.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_off000047df.bin
155f2dd377562fb3263f452296740be0a4acb0d953ac3f2fc5320b2d5644c927
pdf-font-stream PDF embedded font (sfnt) at offset 0x47DF 5220 bytes
font_01_sfnt_off00005981.bin
92d37e886cae1c753f91e7775edfdc2b0aae06955a8d8f36ff5d486f73819c0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5981 10552 bytes
font_02_sfnt_off00007bdb.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDB 4324 bytes