Malicious PDF — malware analysis report

Static analysis result for SHA-256 006f5c452f3ef815…

MALICIOUS

PDF

140.4 KB Created: 2020-08-15 09:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b23c87fb22ab2b7c9f7b7d4b85c9a144 SHA-1: d4fa07f593e03c632cb573eeaefb03e16762a8e5 SHA-256: 006f5c452f3ef815bcae8fd8d77a2747e4c912d120e6d24147aa0d0a96805570
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wb?keyword=amir%20neurologia%20pdf%20gratis'. This URL is likely used to redirect the user to a malicious site. The document also exhibits characteristics of a link farm, with numerous external PDF links, many hosted on Shopify. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wb?keyword=amir%20neurologia%20pdf%20gratis
    • http://files.rosaleswaterdistrict.com/uploads/1/3/0/7/130776268/funatikajijotekedowe.pdf
    • http://bubufip.worshipinternationalchurch.com/uploads/1/3/1/3/131379578/muzemanap.pdf
    • http://julan.ussrbalham.com/uploads/1/3/0/9/130969060/2930218.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/7766/2875/files/57255773500.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6384338271.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/ias_botany_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/ccie_service_provider.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9655/6191/files/kagefimeziruti.pdf
    • https://cdn.shopify.com/s/files/1/0428/8564/4447/files/56019035630.pdf
    • https://cdn.shopify.com/s/files/1/0436/2564/4192/files/ielts_vocabulary_for_writing_task_2.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/guvotajafaxokazonos.pdf
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/32607002448.pdf
    • https://cdn.shopify.com/s/files/1/0437/0386/1416/files/92346877591.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cad0.bin
b710e702a55e4feee20895676bb655fa785baa3d7e550ccf87b126b92f4801ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAD0 5232 bytes
font_01_sfnt_off0001dc80.bin
34de52016d276eae9014853051cb9778f952f08de6bcf31697dc12f908e317f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC80 18872 bytes
font_02_sfnt_off000214c2.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x214C2 4324 bytes

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