Malicious PDF — malware analysis report

Static analysis result for SHA-256 84840c659cd1f7e9…

MALICIOUS

PDF

37.1 KB Created: 2020-08-07 20:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5e28f8897f52e53b26d8d1e441677e9 SHA-1: 881d578d262004fecfb64b1438fd154627699cf2 SHA-256: 84840c659cd1f7e938a89746520685a2a130bb5eb62ebe07edee8fb928e2a89e
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains text suggesting it is an 'answer key PDF', likely a lure to encourage clicks. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link confirms a malicious intent to lead the user to harmful content.

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=pathways+2+answer+key+pdf
    • http://vipujabug.ashleyjoleendoulacare.com/uploads/1/3/0/7/130738720/mukufu-zalosetagaxadan-kiwakajuf.pdf
    • http://files.gullcottagecrafts.net/uploads/1/3/0/8/130815026/f82a2825c1.pdf
    • http://files.vaehstreasures.com/uploads/1/3/1/3/131380596/6252234.pdf
    • http://files.hajrasouliha.com/uploads/1/3/1/4/131437299/rikujiluborafo_fomomod.pdf
    • http://files.abplasticpro.com/uploads/1/3/0/7/130738512/lovakifazab.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/cmm_capability_maturity_model.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3367/files/66059706349.pdf
    • https://cdn.shopify.com/s/files/1/0431/1921/4756/files/jurokajutiwalitaxazibe.pdf
    • https://cdn.shopify.com/s/files/1/0435/2419/4468/files/guduligixowadipugelegeza.pdf
    • https://cdn.shopify.com/s/files/1/0434/3631/0693/files/lefitivegifovufixonasapev.pdf
    • https://cdn.shopify.com/s/files/1/0434/2241/7046/files/68375093891.pdf
    • https://cdn.shopify.com/s/files/1/0434/2421/9293/files/13314431427.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/319051996.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/pulobodukadejutokumasibe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0655/7347/files/radiation_detection_and_measurement_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/ridotozilagosinazonu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/fujalitatewoxoxuxaw.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_off00004711.bin
881fdc959a3f64efe3d82c55b63d4b103b27171c5c666209787613b15cd04cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4711 5116 bytes
font_01_sfnt_off00005877.bin
cf01da91d0796a0b6a1314da299851291e3c42a7d5595652c8d560c7ef610b84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5877 9604 bytes
font_02_sfnt_off00007951.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7951 4324 bytes

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