Malicious PDF — malware analysis report

Static analysis result for SHA-256 6809bf3753bedeaf…

MALICIOUS

PDF

48.6 KB Created: 2020-09-11 09:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1d4e049bfabbcca07a0cf1e5a81be40 SHA-1: 276647ee0ec6b7c39e24649bd417d2dbcb171a3e SHA-256: 6809bf3753bedeafdfbb85c6492f0daeb49dba6744b930dbfc82257ae5861dd2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, with heuristics identifying it as a malicious redirector and a link farm. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to external, potentially malicious, resources through these numerous links.

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/pify?keyword=bootstrap+3+form+sample
    • http://files.retirementtimeline.com/uploads/1/3/0/8/130874143/bugimoxawa.pdf
    • http://files.electpeterhaigis.com/uploads/1/3/0/7/130740148/bakekuwojela.pdf
    • http://files.theherocloset.com/uploads/1/3/0/7/130775490/a9bdd8ae0.pdf
    • http://fogugekeg.worldwarc.ca/uploads/1/3/0/8/130814328/85614303770075.pdf
    • http://files.roborebels.com/uploads/1/3/1/4/131406173/57e3c488.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c3548c_46dafe76be644ef7beea4a96f8500bf7.pdf
    • https://static.usrfiles.com/ugd/0bcf16_573b1a0e857b45608a9ee56b3b4c9e45.pdf
    • https://static.usrfiles.com/ugd/bcfc12_ac5c275afb3a40d3a3f7d3389c6b979d.pdf
    • https://static.usrfiles.com/ugd/353d00_7dae758688fc419dac8f3f9578f2ca7f.pdf
    • https://static.usrfiles.com/ugd/e0d0cf_3a308e004f1e4725a184e10d1b1be0ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc105667636b409cac439df943fa0c99.pdf
    • https://static.usrfiles.com/ugd/cece23_e7b02661f5f7422f9d5a182066e9ad31.pdf
    • https://static.usrfiles.com/ugd/b8c837_165909e2bd984fe8a5d4d9948cac662a.pdf
    • https://static.usrfiles.com/ugd/11baf9_a6983c54af524fad9a7036af9b69a859.pdf
    • https://static.usrfiles.com/ugd/44b221_d81d0882db3646a49386da05265d3bda.pdf
    • https://static.usrfiles.com/ugd/162fe6_dbcb0daab72d4f849923b6b9bce13319.pdf
    • https://static.usrfiles.com/ugd/cb2bed_a9e5bc981f7d4192846727257455a98c.pdf
    • https://static.usrfiles.com/ugd/ad8f3a_dd98f9d12bc44529a0cd460cee60839a.pdf
    • https://static.usrfiles.com/ugd/76156b_fafa0ec553954b1cb960b60930e73a41.pdf
    • https://static.usrfiles.com/ugd/4725f1_2ff87fdb8a7f441ca3f56a64332df54d.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f55.bin
e63bdd1dd3abb78b3dfe30f36e9b2eda0f724189acde7e97e7b75aff0c1cda4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F55 5260 bytes
font_01_sfnt_off00008122.bin
99d953635fb2860d883b7586061fe2366c5683cb1d061b290d90c22814ff0e5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8122 16796 bytes

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