Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebcf90e03079e9f…

MALICIOUS

PDF

46.9 KB Created: 2020-08-14 01:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 322a2f570406a6dd436602dbd4fbedfc SHA-1: 6041c76ef2c0f94fb98a9980e2693d9615f23ffd SHA-256: 7ebcf90e03079e9f36226ac7dd5f49dafbc046b78973685e47ca0dc49e0f8771
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=canchild+f+words+goal+sheet'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify domains, suggests a link farm or SEO poisoning tactic to distribute the malicious redirector. No scripts were extracted from this sample.

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/pify?keyword=canchild+f+words+goal+sheet
    • http://files.freshsenses.ca/uploads/1/3/1/3/131379205/7062644.pdf
    • http://files.westsidewater.ca/uploads/1/3/0/9/130969656/4834889.pdf
    • http://files.bgpianostudio.com/uploads/1/3/1/8/131872286/3de23abf08e.pdf
    • http://files.abitleftandabitlost.com/uploads/1/3/1/4/131438188/luzuxunib.pdf
    • http://files.quickstoptyres.com/uploads/1/3/0/9/130969148/d5158a3fb.pdf
    • https://cdn.shopify.com/s/files/1/0448/3658/5629/files/risk_assessment_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/17033303715.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/sibiren.pdf
    • https://cdn.shopify.com/s/files/1/0431/4975/4519/files/95202943055.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3085/files/livewak.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/faduneresikiwafar.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/bufubuwonufobipaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6327/files/64230901486.pdf
    • https://cdn.shopify.com/s/files/1/0434/3844/0604/files/morfologi_bakteri_bacillus_subtilis.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/60995664881.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1435/files/divitasazilulonudorotepas.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/second_conditional_reading_comprehension.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6806/files/xufonojatifa.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/1/0435/8832/1435/files/divitasazilulonudorotepa

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077c4.bin
bf9da2392b544f4ec110b6fdf3cc3ce5cf3a8e6a39786b325b05f824872214cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C4 5280 bytes
font_01_sfnt_off000089ba.bin
0cb792bf949cc9db50883cf777423983eb2674e495654e0e16c721621a6e99f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89BA 10692 bytes

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