Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c09d3ca08e5689c…

MALICIOUS

PDF

46.1 KB Created: 2020-08-30 03:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef0b57eae3f3d58d03c96472fbe3c14e SHA-1: c5e30c9c0df7a848338f3745cca113cdcf5ff9d7 SHA-256: 1c09d3ca08e5689c723ce3ac7425d2c55bbda975bad1a6723f40778d4fd1ac4b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. Additionally, another critical heuristic detected a PDF link farm, suggesting an attempt to broaden the reach of malicious links. The ML classifier also strongly indicated maliciousness. The embedded URL 'https://ttraff.ru/wix?keyword=test+zavic+valores' is the primary IOC, likely serving as a lure or initial stage of a malicious chain.

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.ru/wix?keyword=test+zavic+valores
    • https://static.usrfiles.com/ugd/c7a620_a6f72810c92743eba2636ebf73b5b9cd.pdf
    • https://static.usrfiles.com/ugd/4b874d_00e115f2c35a48ccbb03d5dfd74ccdaf.pdf
    • https://static.usrfiles.com/ugd/b8c837_8afbc1d284604938b04773cf9b93acff.pdf
    • https://static.usrfiles.com/ugd/cec570_c6cdfe773182431da1fef807b961f98f.pdf
    • https://static.usrfiles.com/ugd/b8c837_adcf0e3d827b45dfb0d27593129c00a1.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/nokagipusutikitinane.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5457/files/unconfined_compression_test_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/6309/9040/files/89486285246.pdf
    • https://cdn.shopify.com/s/files/1/0438/7107/6520/files/grammar_and_writing_practice_book_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/3673/7699/files/evolution_of_gametophyte_and_sporophyte_in_bryophytes.pdf
    • https://cdn.shopify.com/s/files/1/0429/3709/0211/files/catalogo_truper_2020_distribuidor.pdf
    • https://cdn.shopify.com/s/files/1/0459/7127/5943/files/bakagati.pdf
    • https://cdn.shopify.com/s/files/1/0436/2053/2386/files/80117088881.pdf
    • https://cdn.shopify.com/s/files/1/0433/7333/0586/files/bosch_garden_tools_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/define_and_discuss_the_idea_of_sustainable_development.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/
    • https://cdn.shopify.com/s/files/1/043

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000637c.bin
65e7f83c64b7ecc594d1c906d067a22e4dd079e864d798b1ca6ab7bf66e13ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x637C 4852 bytes
font_01_sfnt_off0000740c.bin
3a1af5338feeece313a7bce79b82b83a21d2bc191bdfff7e53cba9f0e574f964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x740C 10024 bytes
font_02_sfnt_off000095f6.bin
9cdc546490d934cae3fa20c06225f9356571fd34debd845061f8ad00e06782cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95F6 16140 bytes

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