Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1dc252a961d8af4…

MALICIOUS

PDF

34.5 KB Created: 2020-08-12 08:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07e6e40b83f3cef5b049168d8267d2d1 SHA-1: 7a587bedd6be6b59f176ffb9b1390a6a99d66953 SHA-256: b1dc252a961d8af44c9f72b047e8a6bb281129efc1317ac9b430ed96e5c01d2a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link

The PDF contains embedded links that lead to a redirector service, which is a common technique for distributing malware or leading users to phishing sites. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=saxon+algebra+1+answers+pdf', suggesting a lure to search for specific content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of the redirector. 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/pify?keyword=saxon+algebra+1+answers+pdf
    • http://files.yogafromthehart.com/uploads/1/3/1/8/131871466/xijuref.pdf
    • http://juriza.masonjarstudio.ca/uploads/1/3/1/8/131872225/2b79f78c2.pdf
    • http://files.liacuu.org/uploads/1/3/1/1/131164311/c769d2a6.pdf
    • https://cdn.shopify.com/s/files/1/0430/9689/9733/files/bacillus_cereus_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/medical_nutrition_therapy_a_case_study_approach_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/9640/8218/files/51189705649.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/kosobofupake.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9816/files/33366708309.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2535/files/animator_s_survival_kit_richard_williams_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/90183044083.pdf
    • https://cdn.shopify.com/s/files/1/0434/8634/7430/files/agro_ecological_regions_of_zimbabwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3566/files/36612914616.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/semigo.pdf
    • https://cdn.shopify.com/s/files/1/0438/7936/6811/files/angle_of_depression_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/1646/2229/files/78245582640.pdf
    • https://cdn.shopify.com/s/files/1/0433/1343/0686/files/90133354207.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049a8.bin
d8206e6fe69f6a125126c9e3907aecba22e8169e42589e1d7565da55edc39206		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49A8 5664 bytes
font_01_sfnt_off00005d0d.bin
36039f4b45c2dbf9eccbdd20db44a244c21c3f90f8bbdcfdfefc7025c2c14de6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0D 9424 bytes

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